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Problems

The surface area of the pyramid

The surface area of the pyramid

Time limit 1 second
Memory limit 128 MiB

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

Input data

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

Output data

Print the total surface area of the regular square pyramid.

Examples

Input example #1
20 10
Output example #1
965.7