from math import log2

P,Q =map(int,input().split())
#P = Q = 10 ** 9
lb = 1
ub = 10 ** 12
i = 0
while i < 10 ** 6 and ub - lb > 0.000003:
    mid = (ub + lb) / 2
    if mid * mid < P + Q * mid * log2(mid):
        lb = mid
    else:
        ub = mid
    i += 1
print(lb)