from math import * 

def f1(N):
    return N*N

def f2(N):
    return P + Q*N*log2(N)

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

th = 10**-5

l = 0
r = 10**20

while r-l > th:
    mid = (l+r) / 2

    if mid == 1 or f1(mid) > f2(mid): r = mid
    else: l = mid

print(r)