#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  if (n <= 10) {
    cout << "0" << endl;
  } else if (n > 10 && n <= 19) {
    cout << "4" << endl;
  } else if (n == 20) {
    cout << "15" << endl;
  } else if (n == 21) {
    cout << "4" << endl;
  } else {
    cout << "0" << endl;
  }
}
