include <stdio.h>

int main() {

int a1, a2, a3, a4, b1, b2, b3, b4, n;
scanf("%d", & n);

a1 = n / 3600;
b1 = n % 3600;

a2 = b1 / 60;
b2 = b1 % 60;

a3 = b2 / 1;

printf("%d:%d:%d", a1, a2, a3);

return 0;

}