func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, i, j, k, q, w, x, y, flag = 0, sum = 0;     char c;     while (true) {       c = getchar();       if (c ==   n ) break;       sum = sum * 10 + int(c -  0 );       q = sum / 2;       sum = sum % 2;     }     if (sum == 1 || q % 2 == 1)       cout <<  0 n ;     else       cout <<  4 n ;     return 0;   }   