func_code_string: #include <bits/stdc++.h>   using namespace std;   int n, m;   int main() {     scanf( %d%d , &n, &m);     if (n > m) swap(n, m);     if (n == 1)       printf( %d n , m / 6 * 6 + 2 * max(m % 6 - 3, 0));     else if (n == 2) {       if (m == 2)         printf( 0 n );       else if (m == 3)         printf( 4 n );       else if (m == 7)         printf( 12 n );       else         printf( %lld n , 1LL * n * m);     } else       printf( %lld n , 1LL * n * m / 2 * 2);     return 0;   }   