import math

p, q = map(int, input().split())

min_n = 1.0
max_n = 10.0 ** 12
nu = 10 ** (- 5)

while max_n - min_n > nu:
    n = (max_n + min_n) / 2
    taka = n ** 2
    hiku = p + q * n * math.log2(n)
    if taka > hiku:
        max_n = n
    else:
        min_n = n

print((max_n + min_n) / 2)