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

int main() {
    long double P, Q;
    std::cin >> P >> Q;

    long double left = 1, right = 1LL << 60;
    while (0.000001 < right - left) {
        long double N = (right + left) / 2;
        if (N * N <= P + Q * N * std::log2(N))
            left = N;
        else
            right = N;
    }

    std::cout << std::fixed << std::setprecision(10);
    std::cout << left << "\n";
}