#include <bits/stdc++.h>
using namespace std;
const long long N = 200005, INF = 2000000000000000000;
long long power(long long a, long long b, long long p) {
  if (a == 0) return 0;
  long long res = 1;
  a %= p;
  while (b > 0) {
    if (b & 1) res = (res * a) % p;
    b >>= 1;
    a = (a * a) % p;
  }
  return res;
}
long long fun(long long x, long long y) {
  long long ans = (y + 1) * (x + 1) * (x + y);
  ans /= 2;
  return ans;
}
int32_t main() {
  std::ios::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
  cout.precision(std::numeric_limits<double>::max_digits10);
  ;
  long long m, b, ans = 0;
  cin >> m >> b;
  for (long long i = 0; i <= b; i++) {
    ans = max(ans, fun(i, ((b - i) * m)));
  }
  cout << ans;
}
