#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, a;
  cin >> n;
  if (n <= 10) {
    a = 0;
  }
  n -= 10;
  if (n >= 1 && n <= 9) {
    a = 4;
  } else if (n == 10) {
    a = 15;
  } else if (n == 11) {
    a = 4;
  }
  cout << a << endl;
  return 0;
}
