#include <bits/stdc++.h>



int main(){
  double P, Q; std::cin >> P >> Q;

  double ub = 1e9, lb = 0;

  auto check =
    [P, Q](double N){
      return N * N < P + Q * N * std::log2(N);
    };

  int N = 200;
  while(N--){
    double mid = (ub + lb) / 2;

    if(check(mid)){
      lb = mid;
    }else{
      ub = mid;
    }
  }

  std::cout << std::fixed << std::setprecision(12) << lb << std::endl;

  return 0;
}