import math

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

x = 1
y = 10 ** 12

while x + (10 ** (-7)) < y:
    
    z = (x + y) / 2
    
    if z ** 2 <= P + Q * z * math.log2(z):
        
        x = z
        
    else:
        y = z
        
print(x)