#include <bits/stdc++.h>
using namespace std;
int32_t main() {
  long long n;
  cin >> n;
  if (n < 11)
    cout << "0" << endl;
  else if (n > 21)
    cout << "0" << endl;
  else {
    if (n - 10 == 10)
      cout << "15" << endl;
    else
      cout << "4" << endl;
  }
  return 0;
}
