#include <bits/stdc++.h>
using namespace std;

using Int = long long;
const char newl = '\n';

template<typename T1,typename T2> inline void chmin(T1 &a,T2 b){if(a>b) a=b;}
template<typename T1,typename T2> inline void chmax(T1 &a,T2 b){if(a<b) a=b;}
template<typename T> void drop(const T &x){cout<<x<<endl;exit(0);}
template<typename T=int>
vector<T> read(size_t n){
  vector<T> ts(n);
  for(size_t i=0;i<n;i++) cin>>ts[i];
  return ts;
}


struct Precision{
  Precision(){
    cout<<fixed<<setprecision(12);
  }
}precision_beet;

//INSERT ABOVE HERE
signed main(){
  cin.tie(0);
  ios::sync_with_stdio(0);

  using D = double;
  D P,Q;
  cin>>P>>Q;

  auto check=[&](D N){
    return N*N<=P+Q*N*log2(N);
  };

  D L=1,R=1e18;
  // check(L) == true
  // check(R) == false
  for(int k=0;k<200;k++){
    D M=(L+R)/2;
    if(check(M)) L=M;
    else R=M;
  }
  cout<<L<<endl;
  return 0;
}