def f2(x, k):
    x *= 10
    x = x // k // 10 * 10 + x // k % 10 // 5 * 10
    x //= 10
    return x


def f(a, b):
    return f2(100 * a, a + b), f2(100 * b, a + b)


def fun_main(aa, bb):
    s = set()
    for a in range(999):
        for b in range(max(1, a), 999):
            if (aa, bb) == f(a, b):
                s.add((a + b))
    print([*sorted([*s])][0])


a, b = map(int, input().split())
fun_main(min(a, b), max(a, b))