#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  long long int n, i, j, k;
  cin >> n;
  if (n <= 10 || n > 21)
    cout << "0\n";
  else if (n > 10 && n <= 19)
    cout << "4\n";
  else if (n == 20)
    cout << "15\n";
  else if (n == 21)
    cout << "4\n";
  return 0;
}
