#include <bits/stdc++.h>
using namespace std;
long long int solve() {
  long long int n;
  cin >> n;
  if (n <= 10 || n > 21)
    return cout << 0 << endl, 0;
  else {
    long long int diff = n - 10;
    if (diff != 10)
      return cout << 4 << endl, 0;
    else
      return cout << 15 << endl, 0;
  }
}
signed main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  long long int tests = 1;
  while (tests--) solve();
  return 0;
}
