typedef long long ll;
typedef long double ld;
#include <bits/stdc++.h>
using namespace std;
const ld EPS = 0.00000000000001;

int main() {
    ld p,q;
    std::cin >> p>>q;
    ld r = 1e15;
    ld l = 1;
    ll cnt = 100000;
    while(r-l>EPS&&cnt>0){
        cnt--;
        
        ld mid = (r+l)/2.0;
        
        if(mid*mid<=p+q*mid*log2l(mid)){
            l = mid;
        }else{
            r = mid;
        }
    }
    
    std::cout <<setprecision(30)<< l << std::endl;
}