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

int main() {
  int A; cin >> A;
  int ans = 10*60 + A*6/10;
  ans %= 1440;
  if(ans/60 < 10) cout << "0";
  cout << ans/60 << ":";
  if(ans%60 < 10) cout << "0";
  cout << ans%60 << endl;
}