#pragma GCC optimize("O3")
#include <bits/stdc++.h>
#define ll long long
#define rep(i,n) for(ll i=0;i<(n);i++)
#define pll pair<ll,ll>
#define pq priority_queue
#define pb push_back
#define eb emplace_back
#define fi first
#define se second
#define ios ios_base::sync_with_stdio(0),cin.tie(0),cout.tie(0);
#define lb(c,x) distance(c.begin(),lower_bound(all(c),x))
#define ub(c,x) distance(c.begin(),upper_bound(all(c),x))

using namespace std;

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;}

const ll INF=1e15;

int main(){
    double P,Q;
    cin >> P >> Q;
    ll times=300;
    double r=1000000000.0;
    double l=1.0;
    
    while(times){
        double mid=(l+r)/2;
        if(mid*mid<=Q*mid*log(mid)/log(2.0)+P){
            l=mid;
        }
        else{
            r=mid;
        }
        times--;
    }
    cout << fixed << setprecision(10);
    cout << l << endl;
    return 0;
}