func_code_string: #include <bits/stdc++.h>   using namespace std;   const long long INF = 1e9 + 7;   const int N = 2e2 + 10;   int main() {     int n, m;     cin >> n >> m;     int l = 1, r = INF;     int ans = 0;     while (l <= r) {       int mid = (r + l) / 2;       int z = mid / 6;       int x = mid / 2 - z;       int y = mid / 3 - z;       if (z >= max(0, n - x) + max(0, m - y))         ans = mid, r = mid - 1;       else         l = mid + 1;     }     cout << ans << endl;     return 0;   }   