P, Q = map(int, input().split())
P = 10 ** 9
Q = 10 ** 9
from math import log2

max1 = 10.0 ** 10
min1 = 1.
h = 10 ** 5
while max1 - min1 > 10 ** (-6) and max1 - min1 > h*10**(-6) :
	h = (max1 + min1) / 2
	if h < P/h + Q*log2(h):
		min1 = h
	else:
		max1 = h
		
print(min1)