def main_function():
    from sys import stdin
    from sys import stdout
    from math import sqrt
    input = stdin.readline
    print = stdout.write

    d1, d2 = list(map(int, input().split()))
    if d1 == d2 or sqrt(d1) == sqrt(d2 / 2):
        print('4')
    elif sqrt(d2 / 2) < sqrt(d1) < sqrt(d2):
        print('8')
    else:
        print('0')


if __name__ == '__main__':
    main_function()