#include <bits/stdc++.h>   using namespace std;   int main() {     int n, ans = 0;     cin >> n;     n -= 10;     if (n == 11) {       ans += 4;       n -= 11;     }     if (n == 10) {       ans = (4 * 4) - 1;       n -= 10;     }     for (int i = 9; i >= 1; --i) {       if (n == i) {         ans += 4;         n -= i;       }     }     cout << ans << endl;     return 0;   }   