include <stdio.h>

int main() {

int a, b, c, d, n, e, f;
scanf("%d", &n);
a = n / 3600;
b = n % 3600;
c = b / 60;
d = b % 60;
e = d / 1;
f = d % 1;
printf("%d:%d:%d", a, c, e );
return 0;

}