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

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    long double p, q; cin >> p >> q;
    long double lf = 1, rg = 1e18;
    for (int ci = 0; ci <= 300; ci++) {
        long double mi = (lf + rg) / 2;
        if ((p + q * mi * log2l(mi)) > (mi * mi)) lf = mi;
        else rg = mi;
    }
    cout << setprecision(16) << lf << "\n";
    return 0;
}