func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios::sync_with_stdio(false);     cin.tie(0);     cout.tie(0);     int a[3] = {0};     int n, t;     cin >> n;     while (n--) {       cin >> t;       a[t]++;     }     int res = min(a[1], a[2]);     a[1] -= a[2];     if (a[1] <= 0) a[1] = 0;     res += a[1] / 3;     cout << res << endl;     return 0;   }   