#include <iostream>
#include <string>
#include <vector>
#include <queue>
#include <deque>
#include <algorithm>
#include <set>
#include <map>
#include <bitset>
#include <cmath>
#include <functional>
#include <iomanip>
#define vll vector<ll>
#define vvvl vector<vvl>
#define vvl vector<vector<ll>>
#define VV(a, b, c, d) vector<vector<d>>(a, vector<d>(b, c))
#define VVV(a, b, c, d) vector<vvl>(a, vvl(b, vll (c, d)));
#define re(c, b) for(ll c=0;c<b;c++)
#define rep(a,b,c) for(ll a=b;a<c;a++)
#define all(obj) (obj).begin(), (obj).end()
typedef long long int ll;
typedef long double ld;
using namespace std;

void get(vll &a){re(i,a.size()) scanf("%lld",&a[i]);}
void get(vvl &a){re(i,a.size()) re(j,a[0].size()) scanf("%lld",&a[i][j]);}
void print(vll &a){re(i,a.size()) cout<<a[i]<<(i==a.size()-1?"\n":" ");}
void print(vvl &a){re(i,a.size()) re(j,a[0].size())cout<<a[i][j]<<(j==a[0].size()-1?"\n":" ");}

int main() {
  ld p, q;std::cin >> p >> q;
  ld l = 1, r = 1000000000;
  re(t, 200){
    ld mid = (l+r)/2;
    ld x = mid * mid;
    ld y = p + q * mid * (log(mid)/log(2)) + 1e-8;
    //std::cout << mid << " " << x << " " << y << '\n';
    if(x>y) r = mid;
    else l = mid;
  }
  //std::cout << fixed << setprecision(20) << log(4)/log(2) << '\n';
  std::cout << fixed << setprecision(20) << l << '\n';

}