#include <iostream>
#include <cstdio>

using namespace std;

int main()
{
    int n, h, m, s;
    cin >> n;
    h = n / 3600;
    n %= 3600;
    m = n / 60;
    n %= 60;
    cout << h << ":" << m << ":" << n;

    return 0;
}