func_code_string: #include <bits/stdc++.h>   using namespace std;   int t, n, m;   long long ans;   int main() {     scanf( %d%d , &n, &m);     if (n == 1)       ans = m;     else if (m == 1)       ans = n;     else if (n == 2)       ans = ((m / 4) * 2 + min(m & 3, 2)) * 2ll;     else if (m == 2)       ans = ((n / 4) * 2 + min(n & 3, 2)) * 2ll;     else       ans = (n * 1ll * m + 1) / 2;     printf( %I64d n , ans);     return 0;   }   