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

max1 = 10 ** 15
min1 = 1
while max1 - min1 > 10 ** (-6):
	h = (max1 + min1) / 2
	if h < P/h + Q*log2(h):
		min1 = h
	else:
		max1 = h
		
print(min1)