committers.top

A list of the most active GitHub users

Most active GitHub users in Sierra Leone

This is a list of most active GitHub users in Sierra Leone over the past year. Other countries/regions can be found here. This list was generated at 2026-03-31 14:25:32 +0000 and machine-readable JSON is available for:

This list is generated with this piece of code. The logic is as follows (in pseudocode): 

githubUsers.sort(_.followers)
           .filter(_.location == 'Sierra Leone') 
           .take(1000)
           .sort(_.contributions)
           .take(256)

This list contains all public contributions for each user. There are 818 total users in the region and you need at least 0 followers to be on this list.

Badges are also available, which you can include on your profile pages. Simply include the following markdown for users: 

[![committers.top badge](https://user-badge.committers.top/sierra_leone_public/USERNAME.svg)](https://user-badge.committers.top/sierra_leone_public/USERNAME)
For organizations, you need to use a slightly different markup: 
[![committers.top badge](https://org-badge.committers.top/sierra_leone_public/ORGNAME.svg)](https://org-badge.committers.top/sierra_leone_public/ORGNAME)
In case you aren't currently ranked on this page, you'll simply receive an "unranked" badge.

Rank User Contribs Picture
1. walonCode
(Mohamed Lamin Walon Jalloh)		 1737 Avatar for walonCode
2. ssturay
(Simeon Stevenson TURAY (PhD))		 666 Avatar for ssturay
3. Jnewton-lab
(James M Bockarie )		 628 Avatar for Jnewton-lab
4. bnjox
(Ben)		 551 Avatar for bnjox
5. AlphaDumbuya
(Alpha Dumbuya)		 528 Avatar for AlphaDumbuya
6. PeeapDev
(mohamed abdul kabia)		 516 Avatar for PeeapDev
7. stElmitchay
(Mitch)		 456 Avatar for stElmitchay
8. saidubundukamara
(Saidu)		 409 Avatar for saidubundukamara
9. samuelmoiwa
(Moiwa)		 375 Avatar for samuelmoiwa
10. Dennis2340
(Dennis Stephen Kamara )		 351 Avatar for Dennis2340
11. davidddeveloper
(David Conteh)		 323 Avatar for davidddeveloper
12. IshmaelKargbo
(Ishmael Kargbo)		 310 Avatar for IshmaelKargbo
13. adewoleeugene
(Jinjon)		 292 Avatar for adewoleeugene
14. mkk2026
(MOMODU KAMARA-KOLLEH)		 276 Avatar for mkk2026
15. ElktrumElk
(Elktrum Elk)		 262 Avatar for ElktrumElk
16. alphashaw
(Alpha Shaw)		 253 Avatar for alphashaw
17. EmmanuelKeifala
(Emmanuel Keifala)		 248 Avatar for EmmanuelKeifala
18. BillohMBarry
(Mohamed Billoh Barry)		 215 Avatar for BillohMBarry
19. joemrnice
(Joseph Lahai Kanu)		 186 Avatar for joemrnice
20. Mmah-Zombo
(M'mah Zombo)		 174 Avatar for Mmah-Zombo
21. Malaikamadi
(Malaika~madi)		 168 Avatar for Malaikamadi
22. Judah40
(Judah Alvin Dore)		 165 Avatar for Judah40
23. Officialsalim12
(Abdul Salim Gani)		 158 Avatar for Officialsalim12
24. Hadesalive
(Alpha Amadu Bah)		 148 Avatar for Hadesalive
25. AmaduKamara
(Amadu Kamara)		 144 Avatar for AmaduKamara
26. Swaray10
(Alusine Swaray)		 133 Avatar for Swaray10
27. Jmsandi
(jm sandi)		 130 Avatar for Jmsandi
28. giantfoe
(Ayorinde John)		 129 Avatar for giantfoe
29. Leonardo14406
(Emmanuel Demby)		 128 Avatar for Leonardo14406
30. HawaKallon
(Hawa Kallon)		 127 Avatar for HawaKallon
31. Johnblesson
(John Blesson-Rowe)		 123 Avatar for Johnblesson
32. Saidu45
(Saidu Tamim Hassan Kamara)		 121 Avatar for Saidu45
33. pessima-au
(pessima_au)		 118 Avatar for pessima-au
34. vidallisk
(Vidal Lisk )		 117 Avatar for vidallisk
35. SUBiango
(UMARU SAHR BIANGO)		 117 Avatar for SUBiango
36. Pateh-Bah
(Ibrahim Pateh Bah)		 114 Avatar for Pateh-Bah
37. Morie55
(Morie Keita)		 104 Avatar for Morie55
38. Dumbuya1475
(Mohamed Super Dumbuy)		 104 Avatar for Dumbuya1475
39. Osman-shaw
(Shaw- Osman 💖)		 103 Avatar for Osman-shaw
40. Algalie
(Algalie kanja kamara)		 101 Avatar for Algalie
41. Kondeh1
(Moriba Sahr Kondeh)		 101 Avatar for Kondeh1
42. hskonneh
(HASSAN SIDIQUE KONNEH)		 98 Avatar for hskonneh
43. beodw
(Beod Wilson)		 94 Avatar for beodw
44. mjames21
(Mohamed James)		 91 Avatar for mjames21
45. Melo034
(Joseph Melvin Kanu)		 90 Avatar for Melo034
46. kode-magic
(Mohamed James Kamara)		 83 Avatar for kode-magic
47. alfredsimeon
(Alfred Simeon Bockarie)		 81 Avatar for alfredsimeon
48. en-learning-centre
(ESTHERNANA LEARNING CENTRE (ELC))		 80 Avatar for en-learning-centre
49. abu-bakarr
()		 80 Avatar for abu-bakarr
50. BarrieLAJ
(Alhaji Abubakarr Barrie)		 77 Avatar for BarrieLAJ
51. solomonx-star
(Solomon kanu)		 74 Avatar for solomonx-star
52. khanuhamza53-star
(Abu-Bakarr-Hamza Kanu)		 73 Avatar for khanuhamza53-star
53. larrybah
(Larry Bah)		 73 Avatar for larrybah
54. AbuJrVandi
(ABU JUNIOR VANDI)		 73 Avatar for AbuJrVandi
55. Daniel32-spec
(Daniel Kamara)		 71 Avatar for Daniel32-spec
56. O-Yin
(Oyinlola Lawal)		 67 Avatar for O-Yin
57. ayodelehazeley
(Ayodele Philip Hazeley)		 65 Avatar for ayodelehazeley
58. Sids-web01
(Sid_Kamz)		 64 Avatar for Sids-web01
59. contehsaidue
(Saidu Conteh)		 64 Avatar for contehsaidue
60. InaConteh
(Ina Moses Conteh)		 62 Avatar for InaConteh
61. barriehassan
(Hassan Barrie)		 62 Avatar for barriehassan
62. Barrie20
(Alpha Yerroh Barrie)		 60 Avatar for Barrie20
63. SaiduDev
(Saidu Mohamed Koroma)		 60 Avatar for SaiduDev
64. pythonnelson
(Isaac NSB Kargbo)		 57 Avatar for pythonnelson
65. okomkamara001
(OKOM KAMARA)		 56 Avatar for okomkamara001
66. Umaru4533
(Umaru Brima Ensah)		 54 Avatar for Umaru4533
67. sankoh-2000
(David Alusine Jeremiah Sankoh)		 54 Avatar for sankoh-2000
68. MBKInsight
(Mohamed Bockarie Koroma)		 53 Avatar for MBKInsight
69. innovator-creator
(John Mark Fornah (Innovator))		 51 Avatar for innovator-creator
70. BigSam8
(Samuel Kamara Jr)		 50 Avatar for BigSam8
71. archibaldjarbee
(Archibald Jarbee)		 49 Avatar for archibaldjarbee
72. micheal-tucker
(Micheal)		 48 Avatar for micheal-tucker
73. Moses-Lamin-Massaquoi
(Moses Lamin Massaquoi)		 47 Avatar for Moses-Lamin-Massaquoi
74. yusifu-m-barrie
(Yusifu M. Barrie)		 46 Avatar for yusifu-m-barrie
75. dmslider
(Desmond Henry)		 46 Avatar for dmslider
76. abdulrahimj
(Abdulrahim Jalloh)		 46 Avatar for abdulrahimj
77. konneh-hub
(Mohamed Kortu Konneh)		 46 Avatar for konneh-hub
78. Zfrahmd
(Zafir Ahmad)		 45 Avatar for Zfrahmd
79. mmsesay
(Muhammad Sesay)		 45 Avatar for mmsesay
80. Jahrulo
(Jallohseray)		 44 Avatar for Jahrulo
81. ksawaneh
(Karim Sawaneh)		 44 Avatar for ksawaneh
82. KusheYemi
(Joel O.K Anthony)		 43 Avatar for KusheYemi
83. HassanProject
(Hassan Kamara)		 43 Avatar for HassanProject
84. MustaphaKoroma
(Mustapha Koroma)		 42 Avatar for MustaphaKoroma
85. Ifuhad622
(Ibraihim Fuhad Suma)		 42 Avatar for Ifuhad622
86. KwakuFrimpong230
(Kwaku Agyemang Frimpong)		 42 Avatar for KwakuFrimpong230
87. cinamagic
(Thomas OBALEH Kargbo)		 41 Avatar for cinamagic
88. jayabdulraman
(Abdulrahman Jalloh)		 41 Avatar for jayabdulraman
89. devlinksl
(Dev-Link Sl )		 41 Avatar for devlinksl
90. 034009589ARUNA
(Aruna Kallon)		 41 Avatar for 034009589ARUNA
91. afofanah
(Abdul Joseph Fofanah)		 40 Avatar for afofanah
92. Ibrahim749
(Ibrahim Sawaneh)		 40 Avatar for Ibrahim749
93. ahmedisankoh1
(Ahmed Ibrahim Sankoh)		 39 Avatar for ahmedisankoh1
94. umarujustinrogers
(Umaru Justin Rogers)		 39 Avatar for umarujustinrogers
95. TommyBangs
(Thomas Daniel Bangura)		 37 Avatar for TommyBangs
96. akamara2002
(Alim Ismael Kamara)		 35 Avatar for akamara2002
97. salGitDev
(Ibrahim Salieu Kamara)		 35 Avatar for salGitDev
98. ibrahimgeorgefoday
(Ibrahim George Foday)		 34 Avatar for ibrahimgeorgefoday
99. SGuissa
(Sulaiman Guissa)		 34 Avatar for SGuissa
100. osehgrant
(Oseh Grant)		 33 Avatar for osehgrant
101. Idris-cs
(Idrissa Kargbo)		 32 Avatar for Idris-cs
102. Francis-Samba
(Francis Sheku William Samba)		 32 Avatar for Francis-Samba
103. HassanA99
(Hassan Wurie Jalloh)		 30 Avatar for HassanA99
104. JohnSorba
(Daniel Ndanema)		 30 Avatar for JohnSorba
105. Kojowest
(Amadu Kargbo)		 30 Avatar for Kojowest
106. BOBSON225
(AUGUSTINE LAHAI)		 30 Avatar for BOBSON225
107. abdulaibahh
(Abdulai Bah)		 30 Avatar for abdulaibahh
108. bakarrsillah
(Abu Bakarr Sillah)		 30 Avatar for bakarrsillah
109. khat-19
(Mawuliah Mansaray)		 29 Avatar for khat-19
110. codelyA23
(mohamed sow)		 29 Avatar for codelyA23
111. laminkamara
(Lamin Kamara)		 28 Avatar for laminkamara
112. luckykargbo
(LUCKY)		 28 Avatar for luckykargbo
113. click2tman
(Tamba Lamin)		 27 Avatar for click2tman
114. DevClass2023
(Devs)		 26 Avatar for DevClass2023
115. joshuacharley
(Joshuascharley)		 26 Avatar for joshuacharley
116. mabinty2025
(mabinty2025)		 26 Avatar for mabinty2025
117. gilbertfullah
(Gilbert Fullah)		 25 Avatar for gilbertfullah
118. Saffa00
(Peter Saffa )		 24 Avatar for Saffa00
119. noahtarawallie
(NOAH)		 24 Avatar for noahtarawallie
120. alhajisesay-a
(Alhaji Sesay)		 24 Avatar for alhajisesay-a
121. 1divine2
(Solomon Abdul Divine Kamara )		 24 Avatar for 1divine2
122. christianlalugba
(Christian Lalugba)		 23 Avatar for christianlalugba
123. edithai1
(edith ai)		 23 Avatar for edithai1
124. joneseugene
(Eugene Jones)		 23 Avatar for joneseugene
125. TheLoneWulf-WA
(ATMR)		 22 Avatar for TheLoneWulf-WA
126. rolandeke
(Chinedum Roland Eke)		 22 Avatar for rolandeke
127. JKHAMARA
(Julius Khamara)		 22 Avatar for JKHAMARA
128. Kingballer028
(Alpha Hamidu Jalloh ID 5193)		 22 Avatar for Kingballer028
129. titustbangura
(Titus T. Bangura)		 21 Avatar for titustbangura
130. turay15818
(Musa Turay)		 21 Avatar for turay15818
131. mjrozelle
(Michael Rozelle)		 20 Avatar for mjrozelle
132. Emmie-B
(Emmanuel Osman Bangura)		 20 Avatar for Emmie-B
133. chillidon
(Philip Kpaleyea)		 20 Avatar for chillidon
134. EmmanuelMitchell
()		 19 Avatar for EmmanuelMitchell
135. jobsesay-cmd
(Junisa Sesay)		 19 Avatar for jobsesay-cmd
136. kingabdulai001
(Abdul Aziz Abdulai)		 19 Avatar for kingabdulai001
137. daudalile
(Dauda)		 19 Avatar for daudalile
138. bantonkoroma
(Ahmed Banton Koroma)		 18 Avatar for bantonkoroma
139. briankarnue
(Brian Karnue)		 18 Avatar for briankarnue
140. kabbajk
(kabbajk)		 18 Avatar for kabbajk
141. Adamssmomoh
(Adams Momoh)		 18 Avatar for Adamssmomoh
142. ishmailsd
(Ishmail Sheriff Daoh)		 18 Avatar for ishmailsd
143. Samuel-Idriss
(Samuel Idriss Kargbo)		 18 Avatar for Samuel-Idriss
144. samuellukegbla
(Samuel Luke Gbla)		 18 Avatar for samuellukegbla
145. AlphaGandorBah
(ALPHA BAH)		 18 Avatar for AlphaGandorBah
146. mikell-code
(Kelly)		 17 Avatar for mikell-code
147. bobdavies
(Bob Davies)		 17 Avatar for bobdavies
148. sarkis08
(Morie Henry Kormoh)		 17 Avatar for sarkis08
149. anwarrturay
(Anwarr O.B Turay)		 17 Avatar for anwarrturay
150. alhajimans2
(Alhaji Mansaray)		 16 Avatar for alhajimans2
151. Emino08
(Emmanuel Koroma)		 16 Avatar for Emino08
152. bayoh
(Bayoh)		 16 Avatar for bayoh
153. naiahcom-regent-news-team
(Dazai)		 15 Avatar for naiahcom-regent-news-team
154. onbod
(Ibrahim Success Swaray)		 15 Avatar for onbod
155. nabieusuma
(Nabieu Suma )		 15 Avatar for nabieusuma
156. MEDVONJOSON
(Mohamed Matthew Vonjoson)		 15 Avatar for MEDVONJOSON
157. KingDavidPro
(David Alieu Conteh)		 15 Avatar for KingDavidPro
158. Deen1984
(Smartcharcoalbriquetteproduction)		 14 Avatar for Deen1984
159. timzaz
(A. J. Wray)		 14 Avatar for timzaz
160. abdulahibarry3
(Abdulahi Barry)		 14 Avatar for abdulahibarry3
161. Lex2222774
(Edmondson_Alex_Bangura)		 14 Avatar for Lex2222774
162. Denis-jk
(Denis Sowa)		 14 Avatar for Denis-jk
163. cyrilsesay
(Cyril Sesay)		 14 Avatar for cyrilsesay
164. Ham-zie
(Hamzie )		 13 Avatar for Ham-zie
165. butagreeza
(Francis Bangura)		 13 Avatar for butagreeza
166. SierraLoneDeveloper
(Edith Edward)		 13 Avatar for SierraLoneDeveloper
167. chief172
(chief)		 13 Avatar for chief172
168. Alfredprosper
(PROSPER)		 13 Avatar for Alfredprosper
169. Wisdom-Kayode
(Wisdom Femi Kayode)		 12 Avatar for Wisdom-Kayode
170. coderPseudoCode
(Alpha Sorie Kargbo)		 12 Avatar for coderPseudoCode
171. codewithaugu
(Augustine Allieu)		 12 Avatar for codewithaugu
172. favourcole9
(Favour Cole)		 12 Avatar for favourcole9
173. solomon-wilson
(Solomon Wilson MBCS, MBA, BSc)		 12 Avatar for solomon-wilson
174. manasseh2024
(Abubakarr Mansaray)		 12 Avatar for manasseh2024
175. VALDOX-001
(Valentine E. Shadi-Sesay)		 11 Avatar for VALDOX-001
176. Eaziking2002
(Ezekiel Sesay )		 11 Avatar for Eaziking2002
177. OpenCaribbean
(Caribbean Open Source)		 11 Avatar for OpenCaribbean
178. LetticiaKamara
(Letticia)		 11 Avatar for LetticiaKamara
179. alimamydadoss
(Alimamy Dadoss)		 11 Avatar for alimamydadoss
180. ZenoPrime
(Mohamed Jawad)		 11 Avatar for ZenoPrime
181. J00543
(James Beale)		 10 Avatar for J00543
182. Sezo-code
(SAHR EDWARD JAMES)		 10 Avatar for Sezo-code
183. Mustapha-Official
(Mustapha Gbanie)		 10 Avatar for Mustapha-Official
184. Godraises
(Joseph Fallah Yondah)		 10 Avatar for Godraises
185. prosperblessing
(Blessing Prosper)		 10 Avatar for prosperblessing
186. jessestephent-gif
(STEVEN IBRAHIM TURAY)		 9 Avatar for jessestephent-gif
187. Shaheedabdul
(Abdul Sahid Jalloh)		 9 Avatar for Shaheedabdul
188. MohamedABAH
(MOHAMED ALHAJI LAMIN BAH)		 9 Avatar for MohamedABAH
189. amidumkamara90-wq
(Amidu Mohamed Kamara)		 9 Avatar for amidumkamara90-wq
190. Lansana4231
(magnifico)		 9 Avatar for Lansana4231
191. eledastudio
(Oluwatosin Babarinde Ayorinde)		 9 Avatar for eledastudio
192. Reema27-ai
(Kxreemaa)		 9 Avatar for Reema27-ai
193. MarkSaffa
(Mark Saffa)		 9 Avatar for MarkSaffa
194. Remadrex01
(Ramandhan Dumbuya)		 9 Avatar for Remadrex01
195. EdwardSKamara
(Edward S Kamara)		 9 Avatar for EdwardSKamara
196. MusaMondeh
()		 8 Avatar for MusaMondeh
197. ibrahimkoroma251-byte
(LEKAD VISION-SL)		 8 Avatar for ibrahimkoroma251-byte
198. colebayk
(Colebayk)		 8 Avatar for colebayk
199. samuelsillah
(Samuel Sillah)		 8 Avatar for samuelsillah
200. Maadalumeh
(Maada Baimba Adam Lumeh)		 8 Avatar for Maadalumeh
201. shorlly4u
(Patrick)		 8 Avatar for shorlly4u
202. Husseinalmansour
(Hussein Al-Mansour)		 7 Avatar for Husseinalmansour
203. codyjazzy778-crypto
(codyjazzy778-crypto)		 7 Avatar for codyjazzy778-crypto
204. tambaseddu
(Tamba Richard Seddu)		 7 Avatar for tambaseddu
205. sydneyhuntalone
(Sydney Renner-Thomas)		 7 Avatar for sydneyhuntalone
206. 22Andrew
(Alhaji Mohamed Kanu)		 7 Avatar for 22Andrew
207. MaximMike-Official
(Michael Jobie Musa)		 7 Avatar for MaximMike-Official
208. Jamesamadu
(PlusCodeAJ)		 7 Avatar for Jamesamadu
209. Unis434
(Unisa Kamara)		 6 Avatar for Unis434
210. Sheku001
(Sheku Isaac koroma )		 6 Avatar for Sheku001
211. LinuxFofinspiron
(Mohamed Fofanah)		 6 Avatar for LinuxFofinspiron
212. THAIMU95
(Thaimu Bangura )		 6 Avatar for THAIMU95
213. Mevizcode
(David Cole)		 6 Avatar for Mevizcode
214. Samuellamei-cmd
(Samuella)		 6 Avatar for Samuellamei-cmd
215. MedKay86
(Mohamed M. Kamara)		 6 Avatar for MedKay86
216. whytekay2020
(Alusine Whyte Koroma )		 6 Avatar for whytekay2020
217. ManieMans
(Emmanuel Saio Mansaray)		 6 Avatar for ManieMans
218. josephkoroma01
(Joseph David Koroma)		 6 Avatar for josephkoroma01
219. Sulaiman897
(Sulaiman Albert Sesay)		 6 Avatar for Sulaiman897
220. awbah
(Amad Wurie Bah)		 6 Avatar for awbah
221. medlaminconteh
(Mohamed Lamin Conteh)		 6 Avatar for medlaminconteh
222. Derek-webapp
(Derek Pratt)		 5 Avatar for Derek-webapp
223. eponkratova
(Eka Ponkratova)		 5 Avatar for eponkratova
224. Leonard-Coker
(Leonard.B.G.Coker)		 5 Avatar for Leonard-Coker
225. paulauvirage
(Paul Robinson)		 5 Avatar for paulauvirage
226. MONRIESHA
(Solomon Amara)		 5 Avatar for MONRIESHA
227. bakarrdansa-dotcom
(Abu Bakarr Dansa Kamara)		 5 Avatar for bakarrdansa-dotcom
228. mjfofanah001
(stemkidd )		 5 Avatar for mjfofanah001
229. ibrahimmohamedsesay
(Ibrahim Mohamed Sesay)		 5 Avatar for ibrahimmohamedsesay
230. MajorSyl
(Sylvanus Fannah)		 5 Avatar for MajorSyl
231. alisonidrissashaad-stack
(MOHAMED Alison IDRISS)		 5 Avatar for alisonidrissashaad-stack
232. Bah548
(maru Bah )		 5 Avatar for Bah548
233. Sheku154
(Sheku Zainab Sesay)		 5 Avatar for Sheku154
234. Don-Chadda
(Peter Daniel Chadda Turay)		 5 Avatar for Don-Chadda
235. Sieh-Mans
(Darklight)		 5 Avatar for Sieh-Mans
236. sammy222206
(Samuel Fillie)		 5 Avatar for sammy222206
237. Lukas-Hassantii
()		 4 Avatar for Lukas-Hassantii
238. tamba10
(TAMBA TEJAN FILLIE )		 4 Avatar for tamba10
239. Mabel007
(Mabel)		 4 Avatar for Mabel007
240. MHK220
(Mohamed Hashim Kamara)		 4 Avatar for MHK220
241. ANSU117
(Ansu bartholomew)		 4 Avatar for ANSU117
242. daboha06-svg
(Alie Daboh)		 4 Avatar for daboha06-svg
243. ibrahim-ishaka-koroma
(ibrahim ishaka koroma)		 4 Avatar for ibrahim-ishaka-koroma
244. Salam-Tec
(Tejan Salam Kamara)		 4 Avatar for Salam-Tec
245. divinetechvusials-ux
(Divine Tech )		 4 Avatar for divinetechvusials-ux
246. UMARKHAN-eng
(Chernor Umaru Bah )		 4 Avatar for UMARKHAN-eng
247. osmantarawally19-glitch
(Osman Tarawally)		 4 Avatar for osmantarawally19-glitch
248. Classy-missy
(Pamella Henretter Haruna)		 4 Avatar for Classy-missy
249. victor5672866
(Samuel Bangura)		 4 Avatar for victor5672866
250. iamdontolo
(Maxwell Osman Kamara)		 4 Avatar for iamdontolo
251. amaduwuriejalloh
(Amadu Jalloh)		 4 Avatar for amaduwuriejalloh
252. teekay1996
(Thaimu Kamara)		 4 Avatar for teekay1996
253. cody-oos
(Francis E. A Brima)		 4 Avatar for cody-oos
254. ABDULAO5
(Abdul Karim Kargbo )		 3 Avatar for ABDULAO5
255. Sanunu
(SANUNU BARRIE)		 3 Avatar for Sanunu
256. cutetom406-byte
()		 3 Avatar for cutetom406-byte

Organizations

Rank Organization Members
1. data-science-salone 2
2. microverseinc 1
3. sinaa-technologies 1
4. mbsse-sl 1
5. communitypro 1
6. peeap 1
7. welbodi 1
8. tenkipay 1
9. isglobal 1
10. domc 1