def fun(a, b):
    m = abs(a - b)
    n = min(a, b) * 2
    res = abs(n - m)
    while n - m > 0 and n >= 2:
        n -= 2
        m += 2
        res = min(res, abs(n - m))
    return res


print(fun(*map(int, input().split())))