// tested by Hightail - https://github.com/dj3500/hightail
import std.stdio, std.string, std.conv, std.algorithm;
import std.range, std.array, std.math, std.typecons, std.container, core.bitop;

long m, b;

void main() {
    scan(m, b);

    long ans = -1;

    foreach (long a ; 0L .. m * b + 1) {
        long ya = (m*b - a) / m;
        long v = a * (a + 1) / 2L * (ya + 1L) + ya * (ya + 1L) / 2L * (a + 1L);

        debug {
            writefln("a: %s, v: %s", a, v);
        }
        ans = max(ans, v);
    }

    writeln(ans);
}


void scan(T...)(ref T args) {
    string[] line = readln.split;
    foreach (ref arg; args) {
        arg = line.front.to!(typeof(arg));
        line.popFront();
    }
    assert(line.empty);
}


void fillAll(R, T)(ref R arr, T value) {
    static if (is(typeof(arr[] = value))) {
        arr[] = value;
    }
    else {
        foreach (ref e; arr) {
            fillAll(e, value);
        }
    }
}