func_code_string: #include <bits/stdc++.h>   using namespace std;   int a, b;   int main() {     while (cin >> a >> b) {       if (b % 2 == 0)         cout << a * b / 2 << endl;       else         cout << a * (b / 2) + a / 2 << endl;     }     return 0;   }   