#include<bits/stdc++.h>
using namespace std;
int main(){
    double p,q;
    cin>>p>>q;
    double l = 1;
    double r = 1e9;
    int qq = 1000;
    cout<<setprecision(15);
    while(qq--){
        double mid = (r+l)/2.;
        double t = mid * mid;
        double s = p + q * mid * log2(mid);
        //cout<<mid<<" "<<t<<" "<<s<<endl;
        if(t<=s) l = mid;
        else r = mid;
    }
    cout<<setprecision(15)<<l<<endl;
}