import sys
input = sys.stdin.readline

from math import log2
P, Q = map(int, input().split())

l = 0.5
r = 10**25
while r - l > 10**(-7):
    m = (r+l)/2
    if m**2 < P or m**2 < P + Q*(m)*log2(m):
        l = m
    else:
        r = m
print(l)