func_code_string: #include <bits/stdc++.h>   int a[100010];   int main() {     int n;     int b = 0, c = 0, d = 0, td = 0, ex1 = 0, ex2 = 0, ex;     scanf( %d , &n);     for (int i = 0; i < n; i++) {       scanf( %d , &a[i]);       if (a[i] == 1)         b++;       else if (a[i] == 2)         c++;       else if (a[i] == 3)         d++;       else if (a[i] == 4)         td++;     }     td += d;     if (c % 2 == 0) {       td += (c / 2);     } else {       ex2 = (c % 2);       td += (c / 2);     }     if (b > d) {       ex1 = b - d;     }     ex = (2 * ex2) + ex1;     if (ex % 4 == 0)       td += (ex / 4);     else       td += (ex / 4) + 1;     printf( %d , td);     return 0;   }   