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

int main() {
	int a;
	cin >> a;
	int h = 10, m = 3 * a / 5;
	while (60 <= m) {
		h++;
		m -= 60;
		h %= 24;
	}
	cout << h << ':' << setw(2) << setfill('0') << m << endl;
	return 0;
}