func_code_string: #include <bits/stdc++.h>   using namespace std;   int a[222], b[222];   int main() {     int n, ans = 0;     cin >> n;     int p, q, r, s;     for (int i = 0; i < n; i++) cin >> a[i] >> b[i];     for (int i = 0; i < n; i++) {       p = q = r = s = 0;       for (int j = 0; j < n; j++) {         if (j == i) continue;         if (a[j] > a[i] && b[j] == b[i]) p++;         if (a[j] < a[i] && b[j] == b[i]) q++;         if (a[j] == a[i] && b[j] > b[i]) r++;         if (a[j] == a[i] && b[j] < b[i]) s++;       }       if (p && q && r && s) ans++;     }     cout << ans;     return 0;   }   