#include <bits/stdc++.h>
#define REP(i, n) for (int i = 0; i < (int)(n); i++)
#define REPLL(i, n) for (ll i = 0; i < (ll)(n); i++)
using namespace std;
template<class T>inline bool chmax(T &a, const T &b){if(a < b){a = b; return 1;}return 0;}
template<class T>inline bool chmin(T &a, const T &b){if(a > b){a = b; return 1;}return 0;}
typedef long long ll;

// yukicoder No.1042 愚直大学
// 2020.06.13



int main(){
  ios::sync_with_stdio(false);
  cin.tie(0);
  double P, Q; cin >> P >> Q;
  double leftOK = 1.0;
  double rightNG = 1e12;
  REP(i, 100){
    double mid = (leftOK+rightNG)/2;
    if(mid*mid <= P+Q*mid*log2(mid)){
      leftOK = mid;
    }else{
      rightNG = mid;
    }
  }
  cout << fixed << setprecision(10) << leftOK << endl;
}