import math

def Bisect_Float(ok,ng,is_ok,eps=1e-12,cnt=0):
    if cnt:
        for _ in range(cnt):
            mid=(ok+ng)/2
            if is_ok(mid):
                ok=mid
            else:
                ng=mid
    else:
        while abs(ok-ng)/max(ok,ng,1)>eps:
            mid=(ok+ng)/2
            if is_ok(mid):
                ok=mid
            else:
                ng=mid
    return ok

P,Q=map(int,input().split())
def is_ok(N):
    return N*N>P+Q*N*math.log2(N)
ans=Bisect_Float(1e10,1e-10,is_ok)
print(ans)