#include <bits/stdc++.h>

using namespace std;
// 7259
int main() {
    int n;
    cin >> n;
    int h = n / 3600;
    int m = (n - h * 3600) / 60;
    int s = n - h * 3600 - m * 60;
    printf("%02d:%02d:%02d\n", h, m, s);

    return 0;
}