import math
#
p, q = map(int, input().split())
#
def f(x):
    return x * x - q * x * math.log2(x) - p

def fprime(x):
    return 2 * x - q * math.log2(x) - q / math.log(2)

def newton(x_0, eps):
    x = x_0
    while True:
        x_prev = x
        x = x_prev - f(x) / fprime(x)
        if abs(x - x_prev) < eps:
            break
    return x

x0 = 1.0
while True:
    x0 *= 10
    if f(x0) > 0:
        break
eps = 1e-6
print(newton(x0, eps))