#include <bits/stdc++.h>
using namespace std;
using ll = long long;

double p, q;

bool f(double mid) {
    double a = mid * mid;
    double b = p + q * mid * log2(mid);
    return a < b;
}

int main() {
    cin >> p >> q;

    double ok = 1, ng = 1e18;
    for(int i = 0; i < 1000; i++) {
        double mid = (ok + ng) / 2;
        (f(mid) ? ok : ng) = mid;
    }
    cout << fixed << setprecision(10) << ok << endl;
}