#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
ll mod = 1000000007;

ll r(ll x, ll y) {
  if (y == 0) return 1;
  else if (y % 2 == 0) return r(x, y/2) * r(x, y/2) % mod;
  else return x * r(x, (y-1)/2) % mod * r(x, (y-1)/2) % mod;
}

int main() {
  double p, q;
  cin >> p >> q;
  double l = 0.0, h = 1000000000.0;
  double m = (l + h) / 2.0;
  bool f = 1;
  while (f) {
    double L = m * m;
    double R = p + q * m * log2(m);
    if (L > R) {
      h = m;
      m = (h + l) / 2.0;
    }
    else {
      l = m;
      m = (h + l) / 2.0;
    }
    if (h - l < 0.0000001) f = 0;
  }
  printf("%.7lf\n", m);
}