from sys import stdin, stdout

input = lambda: stdin.readline().rstrip()
write = stdout.write

def main():
    A, B = map(int, input().split())

    rnd = lambda x: (x * 2 + 1) // 2
    A_, B_ = A / 100, B / 100
    n = 1
    while 1:
        a = rnd(n * A_)
        b = rnd(n * B_)
        if rnd(a / n * 100) == A and rnd(b / n * 100) == B:
            break
        n += 1
    print(n)

main()