from math import log2
eps = 10 ** -6
p, q = map(int, input().split())
l, r = 1, 10 ** 15
while r - l > eps:
    m = (l + r) / 2
    if m ** 2 <= p + q * m * log2(m):
        l = m
    else:
        r = m
print(l)