MOD = 10 ** 9 + 7
INF = 10 ** 10
import sys
sys.setrecursionlimit(100000000)
dy = (-1,0,1,0)
dx = (0,1,0,-1)
from math import log2

def main():
    p,q = map(int,input().split())
    f = lambda x:x*x - q*x*log2(x) - p

    l = 1
    r = 1e11
    for _ in range(200):
        mid = (r + l)/2
        if f(mid) <= 0:
            l = mid
        else:
            r = mid
    print(r)   
if __name__ == '__main__':
    main()