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 PYTHON3):

Solution:
import math
if __name__ == '__main__':

	while True:
		try:
			x = int(input())
			h = int(input())

			if x == 0 and h == 0:
				break

			n = math.sqrt(h ** 2 + (x / 2) ** 2) 
			ans = (x ** 2) + (x * n * 0.5) * 4
			print('{:.5f}'.format(ans))

		except EOFError:
			break