#include<bits/stdc++.h>

using namespace std;
using ll = long long;
using ld = long double;

int main()
{
    ld p, q; cin >> p >> q;
    ld lef = 0, rig = 1e30;
    for(int i = 0; i < 10000; i++) {
        ld mid = (lef + rig) / 2;
        (mid * mid < p + q * mid * log2(mid) ? lef : rig) = mid;
    }
    cout << fixed <<setprecision(12) << lef << endl; 
}