#include <bits/stdc++.h>
using namespace std;
using ll=long long;
using Graph=vector<vector<pair<int,int>>>;
#define INF 1000000000000000000
#define MOD 1000000007

int main(){
  double P,Q;
  cin>>P>>Q;
  double left=1.0;
  double right=1e14;
  while(left+1e-6<right){
    double x=(left+right)/2.0;
    if(x*x-P-Q*x*log2(x)>0){
      right=x;
    }else{
      left=x;
    }
  }
  printf("%lf\n",left);
}