#include <bits/stdc++.h>
using namespace std;
#define REP(i,a,n) for(int i=(a); i<(int)(n); i++)
#define rep(i,n) REP(i,0,n)
#define FOR(it,c) for(__typeof((c).begin()) it=(c).begin(); it!=(c).end(); ++it)
#define ALLOF(c) (c).begin(), (c).end()
typedef long long ll;
typedef unsigned long long ull;


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

  double lb = 1, ub = 1e30;
  rep(i,150){
    double N = (lb+ub)/2;
    if(N<1.0) lb = N;
    else{
      if(N*N < P + Q*N*log(N)/log(2)) lb = N;
      else ub = N;
    }
  }

  printf("%.12lf\n", lb);
  
  return 0;
}