#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

int main() {
  cin.tie(nullptr)->sync_with_stdio(false);
  int p, q;
  cin >> p >> q;
  double ok = 1, ng = 1e18;
  rep(_, 1000) {
    double mid = (ok + ng) / 2;
    double tak = mid * mid;
    double hik = p + q * mid * log2(mid);
    (tak <= hik ? ok : ng) = mid;
  }
  cout << fixed << setprecision(15) << ok << '\n';
  return 0;
}