#include int main() { int time = 0; int sec = 0; scanf("%d%d",&time,&sec); sec = sec + 5; switch (sec) { case 64: sec = 4; break; case 63: sec = 3; break; case 62: sec = 2; break; case 61: sec = 1; break; case 60: sec = 0; default: break; } if(time == 23) { time =0; } printf("%02d:%02d\n", time,sec); return 0; }