#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 if (n <= 21) {
    cout << 4 << endl;
  }
  return 0;
}
