26 users have solved this problem:

admini, he, ngrace, rxw, numb3r5, ryno, BM5, evanl, user, dumpy, lion, newai, horiseun, ndosh, dorian, programmer123, pony_joe1, Lithanium, Gomango999, davinformatics, Matthewwww, ralismark, Ghetto, SirLemonMeringue, Double_Slash, Philip_cpp