from math import log2
import sys
readline = sys.stdin.readline

P, Q = map(float, input().split())

ok, ng = 1.0, float(10**100)
for i in range(10000):
    mid = (ok + ng) / 2
    if mid**2 <= P + Q * mid * log2(mid):
        ok = mid
    else:
        ng = mid

print(ok)