#include <bits/stdc++.h>

using namespace std;

using ll = long double;

constexpr char newl = '\n';

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    ll p, q;
    cin >> p >> q;

    ll ok = 1, ng = 1e18;
    for (int i = 0; i < 1000; i++) {
        ll mid = (ok + ng) / 2;
        (mid * mid <= p + q * mid * log2(mid) ? ok : ng) = mid;
    }
    cout << fixed << setprecision(20) << ok << newl;

    return 0;
}