p,q=map(int,input().split())
from math import *
def f(n):
    if n**2<p+q*n*log2(n):
        return True
    else:
        return False

left=1
right=10**22
while right-left>0.00001:
    mid=(left+right)/2
    if f(mid):
        left=mid
    else:
        right=mid
print(left)