#include <bits/stdc++.h>
using namespace std;
int f[20] = {0, 0, 2, 3, 4, 5, 6, 7, 8, 9, 10, 10, 10, 10, 11};
int main() {
  int n, mark;
  scanf("%d", &n);
  if (n <= 10) {
    cout << 0 << endl;
    return 0;
  }
  int ans = 0;
  for (int i = 1; i <= 4; i++) {
    for (int j = 2; j <= 14; j++) {
      mark = 0;
      if (f[j] == n - 10) {
        ans++;
        mark = 1;
      }
      if (j == 12 && mark == 0) {
        if (1 == n - 10) {
          ans++;
        }
      }
    }
  }
  if (n == 20) ans--;
  cout << ans << endl;
}
