func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, val;     int arr[3] = {0}, count = 0;     cin >> n;     for (int i = 0; i < n; ++i) {       cin >> val;       arr[val]++;     }     if (arr[2] <= arr[1]) {       count += arr[2];       arr[1] -= arr[2];       count += (arr[1] / 3);     } else {       count += arr[1];     }     cout << count;     return 0;   }   