#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  int n, s = 0;
  cin >> n;
  for (int i = 1; i < 11; i++)
    if (i + 10 == n) s += 4;
  if (n == 20) s += 11;
  if (n == 21) s += 4;
  cout << s;
  return 0;
}
