#define _GLIBCXX_DEBUG
#include<bits/stdc++.h>
using namespace std;
#define rep(i,x) for(ll i = 0; i < (ll)(x); i++)
#define rrep(i,x) for(ll i = (ll)(x)-1;0 <= i; i--)
#define reps(i,x) for(ll i = 1; i < (ll)(x)+1; i++)
#define rreps(i,x) for(ll i = (ll)(x); 1 <= i; i--)
#define debug(x) cerr << #x << ": " << (x) << "\n";
#define all(x) (x).begin(), (x).end()
typedef long long ll;
typedef long double ld;
typedef pair<int,int> P;
typedef pair<ll,ll> Pll;
typedef vector<ll> vl;
typedef vector<vector<ll>> vvl;
typedef vector<vector<vector<ll>>> vvvl;
const ll INF = numeric_limits<ll>::max()/4;
const int n_max = 1e5+10;
#define int ll

signed main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    
    ll p,q; cin >> p >> q;
    double ok = 1, ng = 1e18;
    rep(i,1000){
        double x = (ok + ng) / 2.0;
        // debug(x);debug(p + q * x * log2(x));
        if((x * x) < (p + q * x * log2(x)))ok = x;
        else ng = x;
    }

    cout << fixed << setprecision(15);
    cout << ok << endl;
}