#include <bits/stdc++.h>
using namespace std;

int main() {
    long long p, q;
    cin >> p >> q;
    
    long double ok = 1.0, ng = 1e18;
    
    auto f = [&] (double x) -> bool {
        long double l = x * x;
        long double r = (long double) p + q * x * log2(x);
        return (l <= r);
    };
    
    int loop = 100000;
    while (loop--) {
        long double x = (ok + ng) / 2;
        if (f(x)) ok = x;
        else ng = x;
    }
    
    cout << fixed << setprecision(20) << ok << '\n';
    
    return 0;
}