Problem: Create a program that outputs the surface area S of a square cone with a height of h, with a square with one side x as the base. However, assume that the line segment connecting the apex and the center of the base is orthogonal to the base. Also, x and h are positive integers less than or equal to 100.

Input

Given multiple datasets. Each dataset is given in the following format:


x
h


When both x and h are 0, it indicates the end of input.



Output

Output S (real number) on one line for each data set. The output may contain an error of 0.00001 or less.

Example

Input

6
4
7
9
0
0


Output

96.000000
184.192455

Solution (in JAVA):

Solution:
import java.util.*;
import java.io.*;

class Main{
	public static void main(String[]args){
        Scanner sc = new Scanner(System.in);
for(;;){
	int x =sc.nextInt();
	int h =sc.nextInt();
	if(x==0) break;
	
	double ok = x*x+x*Math.sqrt(x*x+h*h*4.0);
	System.out.println(ok);
}
	}
	}