#include<iostream>
#include<string>
#include<vector>
#include<algorithm>
#include<bitset>
#include<set>
#include<map>
#include<stack>
#include<queue>
#include<deque>
#include<list>
#include<iomanip>
#include<cmath>
#include<cstring>
#include<functional>
using namespace std;

#define repr(i, a, b) for (int i = (int)(a); i < (int)(b); i++)
#define rep(i, n) repr(i, 0, n)
#define INF 2e9
#define MOD 1000000007
//#define MOD 998244353
#define LINF (long long)4e18
#define jck 3.141592

const double EPS = 1e-7;

using ll = long long;
using Pi = pair<int,int>;
using Pl = pair<ll,ll>;

int main(){
    int p,q; cin >> p >> q;
    double ok = 1,ng = 1e50;
    while(ng-ok > EPS){
        double mid = (ok+ng)/2;
        if(mid*mid <= p+q*mid*log2(mid)) ok = mid;
        else ng = mid;
    }
    cout << fixed << setprecision(7);
    cout << ok << endl;
}