#include<iostream>
#include<cstdio>

using namespace std;

int main()
{
    int N;
    cin >> N;
    int h = N / 3600;
    N -= h*3600;
    int m = N / 60;
    int s = N % 60;

    cout << h << ':' << m << ':' << s << endl;
    return 0;
}