URI 1019 solution

#include <stdio.h>

int main()

 {

    int N,N1,N2,N3;

    scanf("%d",&N);

    N1 = N/3600;

    N2 = N % 3600/60;

    N3 = N % 60;

    printf("%d:%d:%d
", N1,N2,N3);

    return 0;

}