import java.util.*;
public class Main {

  public static void main(String[] args) { 
      Scanner sc = new Scanner(System.in);
      int p = sc.nextInt();
      int q = sc.nextInt();

      double left = 1.0, right = Math.pow(10, 7);
      while(left < right) {
        double mid = left + (right - left) / 2;
        double res1 = mid * mid;
        double res2 = p + q * mid * Math.log(mid) / Math.log(2);
        if(res1 == res2) break;
        if(res1 < res2)
          left = mid;
        else
          right = mid;
      }
      System.out.println(right);
  }
}