#include "bits/stdc++.h"
using namespace std;
#define int long long
#define REP(i, n) for (int i = 0; i < (int)n; ++i)
#define RREP(i, n) for (int i = (int)n - 1; i >= 0; --i)
#define FOR(i, s, n) for (int i = s; i < (int)n; ++i)
#define RFOR(i, s, n) for (int i = (int)n - 1; i >= s; --i)
#define ALL(a) a.begin(), a.end()
#define IN(a, x, b) (a <= x && x < b)
template<class T>inline void out(T t){cout << t << "\n";}
template<class T,class... Ts>inline void out(T t,Ts... ts){cout << t << " ";out(ts...);}
template<class T>inline bool CHMIN(T&a,T b){if(a > b){a = b;return true;}return false;}
template<class T>inline bool CHMAX(T&a,T b){if(a < b){a = b;return true;}return false;}
constexpr int INF = 2e18;


signed main(){
	int P,Q;
	cin >> P >> Q;
	double l = 0,r = 1e18;
	auto f = [&](double x){
		return x * x <= (double)P + (double)Q * x * log2(x);
	};
	REP(i,200){
		double m = (l + r) / 2.0;
		if(f(m))l = m;
		else r = m;
	}
	printf("%.20lf\n",l);
}

/*
auto f =[&](int x)->bool{
	
};
int l = -1, r = 1e18 + 1;
while(r - l > 1){
	int c = (l + r) / 2;
	if(f(c)) r = c;
	else l = c;
}
cout << r << endl;
*/