import math


def main():
    p, q = map(int, input().split())

    a = 0
    for i in range(1, 10):
        x = 10 ** i
        if x >= p/x + q * math.log2(x):
            a = i
            break

    ng = 10 ** (a - 1)
    ok = 10 ** a

    while ok - ng > ng * (10 ** (-5)):
        mid = (ok + ng) / 2
        if mid > p/mid + q * math.log2(mid):
            ok = mid
        else:
            ng = mid

    print(ng)




main()