#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <cstdio>
#include <cstring>
#include <cmath>
using namespace std;

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

    a = a / 10 * 6;

    int x = 10, y = 0;
    y += a;
    x += y / 60; y %= 60;
    x %= 24;

    printf("%02d:%02d\n", x, y);

    return 0;
}