#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(int)(n);i++)
using namespace std;
using ll = long long ;
//using P = pair<int,int> ;
using pll = pair<long long,long long>;
constexpr int INF = 1e9;
constexpr long long LINF = 1e18;
constexpr int MOD = 1000000007;
double P,Q;

bool ok(double mid){
    double taka = mid * mid;
    double tei = P + Q * mid * log2(mid);
    return taka <= tei;
}

int main(){
    cin >> P >> Q;
    double left = 1,right = LINF;
    rep(i,10000){
        double mid = (left + right)/2;
        if(ok(mid)) left = mid;
        else right = mid;
    }
    cout << setprecision(20) << left << endl;
    return 0;
}