#include <cmath>
#include <string>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
int main() {
	int P, Q;
	cin >> P >> Q;
	double l = 1.0, r = 1.0e+22;
	for (int i = 0; i < 200; ++i) {
		double m = (l + r) * 0.5;
		double va = m * m;
		double vb = P + Q * m * log2(m);
		if (va < vb) l = m;
		else r = m;
	}
	cout.precision(15);
	cout << fixed << r << endl;
	return 0;
}