#include <bits/stdc++.h>
using namespace std;
long long toi(string s) {
  istringstream is(s);
  long long x;
  is >> x;
  return x;
}
string tos(long long t) {
  stringstream st;
  st << t;
  return st.str();
}
int main() {
  int n, ans;
  cin >> n;
  ans = 0;
  if (n > 10 && n <= 21) {
    if (n == 20)
      ans = 15;
    else
      ans = 4;
  }
  cout << ans << endl;
  return 0;
}
