#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll=long long;
using ld=long double;
ld pie=3.141592653589793;
ll inf=1444999999999999;
ll mod=998244353;
int main(){
    ld p,q;
    cin >> p >> q;
    ld left=1.0,right=mod;
    for (ll i = 0; i < 1000; i++)
    {
        ld mid=(right+left)/2.0;
        ld x=log(2.0);
        ld y=log(mid);
        y/=x;
        if (mid*mid<q*mid*y+p)
        {
            left=mid;
        }else{
            right=mid;
        }
    }
    cout << setprecision(100) << left << endl;
}