#include<iostream>
#include<algorithm>
#include <vector>
#include<cmath>
using namespace std;
typedef long long int lont;
int main() {
	int a;
	cin >> a;
	int H = 10;
	int M = 0;
	int K = (3 * a) / 5;
	H += K / 60;
	M += K % 60;
	if (M < 10) {
		cout << H << ':' << 0 << M << endl;
	}
	else {
		cout << H << ':' << M << endl;
	}
}