from math import log2

p, q = map(int, input().split())
left = 0
right = 1 << 63
for _ in range(10000):
    mid = (left + right) / 2
    t1 = mid**2
    t2 = p + q * mid * log2(mid)
    if t1 <= t2:
        left = mid
    else:
        right = mid
print(left)