from math import log2

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

ok = 1
ng = 10 ** 11


def hantei2(a):
    takahashi = a * a
    hikuhashi = p + q * a * log2(a)
    return takahashi <= hikuhashi


while ng - ok > 10 ** (-5):
    mid = (ok + ng) / 2
    if hantei2(mid):
        ok = mid
    else:
        ng = mid
print(ok)