a, b = map(int, input().split())


match = min(a, b) * 2
unmatch = a + b - match


if unmatch >= match:
    print(unmatch - match)
else:
    ans = abs(match - unmatch)
    for _ in range(100):
        match -= 2
        unmatch += 2
        if match >= 0:
            ans = min(ans, abs(match - unmatch))
    print(ans)