#include <bits/stdc++.h>

using namespace std;
using ld = long double;

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

    ld P, Q;
    cin >> P >> Q;
    ld l=1, r=4e10, c;
    for (int i=0; i<1000; i++){
        c = (l+r)/2;
        if (c <= P/c+Q*log2(c)) l=c;
        else r=c;
    }

    cout << setprecision(18) << l << endl;

    return 0;
}