#include <iostream>
#include <cmath>
#include <iomanip>
using namespace std;
using ll = long long int;

int main(){
    ll p, q;
    cin >> p >> q;

    long double ac = 1.0;
    long double wa = 1e18;
    while(wa-ac > 0.0000001){
        long double wj = (wa+ac)/2;
        if(wj <= (long double)q*log2(wj)+(long double)p/wj) ac = wj;
        else wa = wj;
    }
    cout << fixed << setprecision(10) << ac << endl;
    return 0;
}