#include <bits/stdc++.h>

using namespace std;

template <typename T> T gcd(T x, T y) {
  if (y == 0)
    return x;
  return gcd(y, x % y);
}

template <typename T> T lcm(T x, T y) {
  if (x == 0 || y == 0)
    return 0;
  return x / gcd(x, y) * y;
}

int main() {
  int a;
  cin >> a;
  int H = 10, M = 0;
  int tmp = a * 6 / 10;
  H += tmp / 60;
  M += tmp % 60;

  cout << H << ':' << setw(2) << setfill('0') << M << endl;
}