import math

P, Q = map(int, input().split())

l, r = 1, 2

while r * r < P + Q * r * math.log2(r):
    r *= 2

while r - l > 10**(-5):
    m = l + (r-l)/2
    if m * m <= P + Q * m * math.log2(m):
        l = m
    else:
        r = m

print(l)