func_code_string: #include <bits/stdc++.h>   using namespace std;   int main(void) {     int count;     int n;     int rub;     int a[100000];     int b[100000];     int a_1234[4] = {0, 0, 0, 0};     int sum = 0;     cin >> n;     for (int i = 0; i < n; i++) {       cin >> rub;       a_1234[rub - 1]++;     }     sum = a_1234[3] + a_1234[2];     a_1234[0] -= a_1234[2];     if (a_1234[0] < 0) a_1234[0] = 0;     sum += a_1234[1] / 2;     a_1234[1] = a_1234[1] % 2;     sum += (a_1234[1] * 2 + a_1234[0]) / 4;     if ((a_1234[1] * 2 + a_1234[0]) % 4 != 0) sum++;     cout << sum;     getchar();     getchar();     return 0;   }   