#include<bits/stdc++.h>

using namespace std;
using ll=long long;
#define rep2(i, a, n) for(int i = (a); i < (n); i++)
#define rep(i, n) rep2(i,0,n)
#define EPS 1e-7

int main(){
  cin.tie(nullptr);ios_base::sync_with_stdio(false);
  int p,q;cin>>p>>q;
  double ok=1,ng=1e12,md;
  rep2(i,0,1010){
		md = (ok + ng) / 2;
    //Q ∗ N ∗ log2 N
    //nの値を絞っていく
		if (md * md <= p + 1.0 * q * md * log2(md) + EPS) ok = md;
		else ng = md;
  }
  cout<<fixed<<setprecision(15)<<ok<<endl;
}