mod = 1000000007
eps = 10**-9


def main():
    import sys
    input = sys.stdin.readline

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

    if a == b:
        print(4)
    elif b < a:
        print(0)
    elif a == 2*b:
        print(4)
    elif a > 2*b:
        print(0)
    else:
        print(8)


if __name__ == '__main__':
    main()