#include <bits/stdc++.h>   using namespace std;   int main() {     long long m, b;     cin >> m >> b;     long long Max = 0;     for (long long i = b; i >= 0; i--) {       long long p = (m * b - m * i + 1) * (i + 1) * (m * b - m * i + i) / 2;       Max = max(p, Max);     }     printf( %I64d , Max);     return 0;   }   