mod = 1000000007
eps = 10**-9


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

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

    mod = 1000000007
    eps = 10 ** -9

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

        b, a = 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()


if __name__ == '__main__':
    main()