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

import math

def is_ok(x):
    return x**2 - (P+Q*x*math.log2(x))<0
    
y = pow(10,20)
x = 1
while y-x>0.000001:
    mid = (y+x)/2
    if is_ok(mid):
        x = mid
    else:
        y = mid
print(x)