# The surface area of the cone

Execution time limit is 1 second Runtime memory usage limit is 64 megabytes Calculate the total surface area of a truncated cone, if we know the base radius R, r and height h.

## Input

In a single line of succession through a gap defined, respectively, the base radius R, r and height h. All input data are integers, not exceeding 100.

## Output

In a single line to bring the total surface area of a truncated cone. Result output to two decimal places.

## Examples