import sys
import math


def input(): return sys.stdin.readline().rstrip('\n')


def main():
    p, q = map(int, input().split())
    lo = 1
    hi = 10 ** 18
    for _ in range(100):
        mi = (lo + hi) / 2
        if mi ** 2 < p + q * mi * math.log2(mi):
            lo = mi
        else:
            hi = mi
    print((lo + hi) / 2)


if __name__ == '__main__':
    ret = main()
    if ret is not None:
        print(ret)