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

apb = 1
while 1:
    for a in range(apb + 1):
        b = apb - a
        if A * apb - 0.5 * apb <= 100 * a < A * apb + 0.5 * apb:
            if B * apb - 0.5 * apb <= 100 * b < B * apb + 0.5 * apb:
                print(apb)
                exit()
    apb += 1