func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     map<int, int> m;     cin >> n;     int a[n];     for (int i = 0; i < n; i++) {       cin >> a[i];       m[a[i]]++;     }     int chek[32];     chek[0] = 2;     for (int i = 1; i < 32; i++) {       chek[i] = chek[i - 1] * 2;     }     int sm = 0, coun = 0;     for (int i = 0; i < n; i++) {       for (int j = 0; j < 32; j++) {         int h = chek[j] - a[i];         if (m.find(h) != m.end()) {           if (h == a[i] && m[a[i]] > 1) {             coun++;             break;           }           if (h != a[i]) {             coun++;             break;           }         }       }     }     cout << n - coun << endl;     return 0;   }   