func_code_string: #include <bits/stdc++.h>   using namespace std;   const int maxn = INT_MAX;   int main() {     ios_base::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);     long long n, m;     cin >> n >> m;     if (n > m) {       swap(n, m);     }     if (n == 1) {       if (m % 6 == 0) {         cout << n * m;       } else if (m % 6 == 5) {         cout << n * m - 1;       } else if (m % 6 == 4) {         cout << n * m - 2;       } else {         cout << n * m - m % 6;       }     } else if (n == 2) {       if (m == 2) {         cout << 0;       } else if (m == 3) {         cout << 4;       } else if (m == 7) {         cout << 12;       } else {         cout << m * 2;       }     } else {       cout << n * m / 2 * 2;     }     return 0;   }   