#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  int n;
  cin >> n;
  if (n == 21)
    cout << 4 << "\n";
  else if (n > 20)
    cout << 0 << "\n";
  else if (n >= 11 and n < 20)
    cout << 4 << "\n";
  else if (n <= 10)
    cout << 0 << "\n";
  else {
    if (n == 20) cout << 15 << "\n";
  }
}
