#include <bits/stdc++.h>
using namespace std;
class point {
 public:
  int id, val;
};
bool operator<(const point &a, const point &b) {
  if (a.val < b.val) return true;
  return false;
}
int n;
int main() {
  cin >> n;
  n -= 10;
  if (n == 10)
    cout << 15;
  else if ((n >= 1) && (n <= 11))
    cout << 4;
  else
    cout << 0;
  return 0;
}
