#include <bits/stdc++.h>
using namespace std;
using ll = long long;
template <class T, class U> using Pa = pair<T, U>;
template <class T> using vec = vector<T>;
template <class T> using vvec = vector<vec<T>>;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    double P,Q;
    cin >> P >> Q;
    double l = 1,r = 1e9;
    for(int i=0;i<100;i++){
        double m = (l+r)/2;
        double a = m*m,b = P+Q*m*log2(m);
        if(a<=b) l = m;
        else r = m;
    }
    cout << fixed << setprecision(10) << l << "\n";
}