func_code_string: #include <bits/stdc++.h>   using namespace std;   long long n, m;   int main() {     cin >> n >> m;     if (n > m) swap(n, m);     if (n == 1) {       cout << 6 * (m / 6) + 2 * max(m % 6 - 3, (long long)0);       return 0;     }     if (n == 2) {       if (m == 2) {         cout << 0;         return 0;       }       if (m == 3) {         cout << 4;         return 0;       }       if (m == 7) {         cout << 12;         return 0;       }     }     if (n % 2 == 0 || m % 2 == 0) {       cout << n * m;       return 0;     }     cout << n * m - 1;     return 0;   }   