import math

p, q = map(int, input().split())

ok = 1
ng = 1e12

for i in range(1000):
    mid = (ok + ng) / 2
    x  = mid * mid
    y = p + q * mid * math.log2(mid)
    if x < y:
        ok = mid
    else:
        ng = mid
print(ok)