#include<iostream>
#include<string>
#include<iomanip>
#include<cmath>
#include<vector>
#include<algorithm>
#include<utility>

using namespace std;

#define int long long
#define endl "\n"

constexpr long long INF = (long long)1e18;
constexpr long long MOD = 1'000'000'007; 

struct fast_io {
	fast_io(){
		std::cin.tie(nullptr);
		std::ios::sync_with_stdio(false);
	};
} fio;

long double P, Q;

bool check(long double m){
	
	if(m <= 1.0) return true;
	
	if(m * m > P + Q *  m * log2(m)) return false;
	
	return true;
}

signed main(){
	cout<<fixed<<setprecision(10);
	
	
	long double l = 1.0, h = 1e10, m;
	
	cin>>P>>Q;
	
	for(int i = 0; i <= 100; i++){
		m = (l + h) / 2;
		
		if(check(m)) {
			l = m;
		} else {
			h = m;
		}
	}
	
	
	cout<<l<<endl;
	
	return 0;
}