#include<bits/stdc++.h>

using namespace std;
using ll = long long int;
using lc = complex<double>;

int main(void) {
    constexpr ll MOD = 1e9 + 7;
    constexpr double PI = acos(-1);
    cout << fixed << setprecision(32);
    cin.tie(0); ios::sync_with_stdio(false);

    double p, q;
    cin >> p >> q;
    double ok = 1, ng = 1e20;
    for(ll i=0; i<10000; i++) {
        double mid = (ok + ng) / 2;
        (mid * mid < p + q * mid * logl(mid) / logl(2) ? ok : ng) = mid;
    }
    cout << ok << endl;
}