#include <bits/stdc++.h>
using namespace std;
const int MOD = 1000000000 + 7;
int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  cout.tie(nullptr);
  int t;
  cin >> t;
  if (t <= 10 || t > 21)
    cout << 0 << "\n";
  else if (t == 20)
    cout << 15 << "\n";
  else if (t < 20 || t == 21)
    cout << 4 << "\n";
}
