import math

p, q = map(int, input().split())

ok = 1
ng = 1e12
mid = 0
while ng - ok > 0.000001:
    mid = (ok + ng) / 2
    if mid ** 2 > p + q * mid * (math.log(mid, 2)):
        ng = mid
    else:
        ok = mid

print(ng)