#include <cmath>
#include <iomanip>
#include <iostream>
using namespace std;

int main()
{
    double P, Q;
    cin >> P >> Q;
    double ok = 1, ng = 1.0e40;
    for (int t = 0; t < 10000; t++)
    {
        double c = sqrt(ok * ng);
        double taka = c * c;
        double hiku = P + Q * c * log2(c);
        (taka < hiku ? ok : ng) = c;
    }
    cout << fixed << setprecision(10) << ok << '\n';
}