Problems

# 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