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 CPP):

Solution:
#include <iostream>
#include <math.h>

# define REP(i,n) for(int i=0; i<n;i++)

using namespace std;

int main(){
	while(1){
		double x, h, ans;
		cin >> x >> h;
		if (x==0 && h==0) return 0;
		ans = sqrt((x/2)*(x/2)+h*h)*x*2+x*x;
		printf("%.6lf\n",ans);
	}
	return 0;
}