#include <iostream>
#include <cstdio>

using namespace std;

int main()
{
    long time;
    cin >> time;
    int hour, minute, second;
    int result;
    hour = time / 3600;
    result = time % 3600;
    minute = result / 60;
    second = result % 60;

    cout << hour <<":" << minute << ":" << second;

    return 0;
}