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