func_code_string: #include <bits/stdc++.h>   using namespace std;   int n, m;   int main() {     scanf( %d%d , &n, &m);     if (n > m) swap(n, m);     int ans;     if (n == 1)       ans = m;     else if (n == 2) {       if (m % 4 <= 2)         ans = m + m % 4;       else         ans = m + 1;     } else       ans = (n * m + 1) / 2;     printf( %d n , ans);     return 0;   }   