import sys


def main():
    sys.setrecursionlimit(1000000)
    input = lambda: sys.stdin.readline()[:-1]
    A, B = map(int, input().split())

    good = min(A, B) * 2
    bad = A + B - good
    print(abs(good - bad) if bad else (good % 2) * 2)


if not __debug__:
    f = open(sys.argv[1], "r")
    sys.stdin = f

main()