def calc(x, m):
    ret = 0
    now = 2
    i = 2
    d = x // i
    while i <= m:
        while i + 1 <= m and d == x // (i + 1):
            i += 1
        ret += x * (i - now + 1) - (i - now + 1) * (i + now) // 2 * d
        i += 1
        d = x // i
        now = i
    return ret

N, M = map(int, input().split())
ans = 0
for i in range(1, N + 1):
    ans = max(ans, calc(i, M))
print(ans)