import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
sys.setrecursionlimit(10 ** 7)

from math import log2

p, q = map(int, read().split())
low = 0
high = 10 ** 18


while high - low > 1e-6:
    mid = (low + high) / 2
    if mid ** 2 <= q * mid * log2(mid) + p:
        low = mid
    else:
        high = mid
print(high)