44 users have solved this problem:

evanl, brchen, Bean, tom93, justin_g_20, ngrace, dumpy, numb3r5, ar88lo, phoebe, bear1212, pony_joe1, ETK, lion, user, fisherman, lpf, testcoder, Salamander, sheep, RileyO, thimote75, rnl, stupidguy13, lukameladze, Phantom_Performer, lukamosiashvili, gurkot, ndosh, sabukatsire, Dzadzo, NintsiChkhaidze, horiseun, caterpillow, davinformatics, anson, Double_Slash, SiliconSquared, Ghetto, yixiu, ja_kingy, ludissey, Nonoze, Matthewwww