#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;
 
//template
#define rep(i,a,b) for(int i=(a);i<(b);i++)
#define rrep(i,a,b) for(int i=(a);i>(b);i--)
#define ALL(v) (v).begin(),(v).end()
typedef long long int ll;
const int inf = 0x3fffffff; const ll INF = 0x1fffffffffffffff; const double eps=1e-12;
void tostr(ll x,string& res){while(x)res+=('0'+(x%10)),x/=10; reverse(ALL(res)); return;}
template<class T> inline bool chmax(T& a,T b){ if(a<b){a=b;return 1;}return 0; }
template<class T> inline bool chmin(T& a,T b){ if(a>b){a=b;return 1;}return 0; }
//end
 
 
 
int main(){
   int p,q; cin>>p>>q;
   double lb=1,rb=INF;
   rep($,0,70){
      double mid=sqrt(lb*rb);
      if(mid*mid<=q*mid*log2(mid)+p)lb=mid; else rb=mid;
   } printf("%.12f",lb);
   return 0;
}