import sys
import math

sys.setrecursionlimit(10 ** 8)

input = sys.stdin.readline


def main():
    P, Q = [int(x) for x in input().split()]

    def isOK(mid):
        return (mid ** 2) < P + Q * mid * math.log2(mid)

    ok = 1
    ng = 10 ** 20

    while abs(ok - ng) > (10 ** -5):
        mid = (ok + ng) / 2
        if isOK(mid):
            ok = mid
        else:
            ng = mid

    print(ok)


    
    

if __name__ == '__main__':
    main()