import math

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

high=10**90+1
low=-1

while high-low>10**-5:
    mid=(high+low)/2
    taka=P+Q*mid*math.log2(mid)
    hiku=mid**2
    if taka==hiku:
        break
    elif taka<hiku:
        high=mid
    else:
        low=mid

print(mid)