#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); i++)
using namespace std;
typedef long long ll;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(0);
    
    using ld = long double;
    ld P,Q; cin >> P >> Q;
    auto f = [P, Q](ld N) {
        return N * N <= P + Q * N * log2l(N);
    };

    ld ok = 1, ng = 1e18;
    rep(_,100) {
        ld mid = (ok + ng) * 0.5;
        (f(mid) ? ok : ng) = mid;
    }

    cout << fixed << setprecision(20) << ok << endl;
}