#include <bits/stdc++.h>
using namespace std;

int main()
{
    int a;
    cin >> a;

    int t =  a * 600 / 1000;

    int h = 10, m = 0;
    h += t / 60;
    m = t % 60;

    printf("%02d:%02d\n", h, m);

    return 0;
}