e-olymp
Problems

The surface area of the pyramid

The surface area of the pyramid

Find the total surface area of the regular square pyramid with base length a and height h.

Input

One line contains the base length a and height of pyramid h. All input data are integers, not exceeding 100.

Output

Print the total surface area of the regular square pyramid.

Time limit 1 second
Memory limit 128 MiB
Input example #1
20 10
Output example #1
965.7