// I SELL YOU...! 
#include<iostream>
#include<vector>
#include<algorithm>
#include<functional>
#include<queue>
#include<chrono>
#include<iomanip>
#include<map>
#include<set>
#include<cmath>
using namespace std;
using ll = long long;
using P = pair<ll,ll>;
using TP = tuple<ll,ll,ll>;
void init_io(){
  cin.tie(0);
  ios::sync_with_stdio(false);
  cout << fixed << setprecision(18);
}
signed main(){
  init_io();
  ll p,q;
  double l=1,r=1e18,h;
  cin >> p >> q;
  for(int i=0;i<100000;i++){
    h = (l+r)/2;
    if(h*h<=p+q*h*log2(h)){
      l = h;
    }else{
      r = h;
    }
  }
  cout << l << endl;
}