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

int main(){
    int64_t p, q;
    cin >> p >> q;
    auto f = [&](double n){
        return p + q * n * log2(n);
    };

    double l = 1, r = 1e18;
    for (int i = 0; i < 100; i++){
        double mid = (l + r) / 2;
        (mid * mid < f(mid) ? l : r) = mid;
    }

    cout << setprecision(20) << l << endl;
}