What is the inverse of the following statement?

"If a polygon does not have five sides, then the polygon is a rectangle."

If the polygon is a rectangle, then the polygon does not have five sides.
If the polygon is not a rectangle, then the polygon has five sides.
If the polygon does not have five sides, then the polygon is not a rectangle.
If the polygon has five sides, then the polygon is not a rectangle.

If the polygon is not a rectangle, then the polygon does not have five sides.