#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  if (n <= 10 || n > 21)
    cout << "0" << endl;
  else if (n == 20)
    cout << "15" << endl;
  else
    cout << "4" << endl;
  return 0;
}
