def input_int():
    return int(input())

def input_ints():
    return list(map(int, input().split()))

from math import log2

P, Q = input_ints()

l = 0
r = 1e9

for _ in range(200):
    m = (l + r) / 2
    if m**2 < P + Q * m * log2(m):
        l = m
    else:
        r = m

print(r)