#include <iostream>
#include <iomanip>
#include <cstdint>
#include <cmath>

using namespace std;

int main()
{
	cin.tie(nullptr);
	ios::sync_with_stdio(false);

	uint32_t P, Q;
	cin >> P >> Q;

	auto l = 1.0, r = 1e18;
	while (r - l >= 1e-5)
	{
		const auto c = (l + r) / 2;
		if (c * c <= P + Q * c * log2(c)) l = c;
		else r = c;
	}

	cout << fixed << setprecision(10) << l << '\n';
	return 0;
}