import itertools


def round_check(N, div, round):
    return div * (2 * round - 1) <= 2 * N < div * (2 * round + 1)


A, B = map(int, input().split())

it = itertools.product(range(500), repeat=2)
next(it)

ans = 2000
for a, b in it:
    if round_check(100 * a, a + b, A) and round_check(100 * b, a + b, B):
        ans = min(ans, a + b)
print(ans)