35 users have solved this problem:

jqxcz, hollwo_pelw, testcoder, he, lion, horiseun, Netanya, Gomango999, user, phoebe, Magikarp4000, dorian, xiaoxiong, lilu, eds, ad_red, pony_joe1, Lithanium, ralismark, RonXueAlt, Matthewwww, SirLemonMeringue, Uasoni2, caterpillow, programmer123, Double_Slash, WenDidIAsk, BigD, Ghetto, OneT_Chen, blx330, davinformatics, awu, OoogaDooga, Supermarine_Spitfire