#include <iostream>
#include <cmath>
#include <iomanip>
using namespace std;
int main(){
  long long p,q;cin>>p>>q;

  long double mn = 1;
  long double mx = 1000000000000;
  while(mx-mn > 1e-6){
    long double ce = (mn+mx)/2;
    if(ce-(long double)(p/ce) >= q*log2(ce)){
      mx = ce;
    }else{
      mn = ce;
    }
  }
  cout << fixed << setprecision(10) << mx << endl;

}