Best budget lens for the pentax k 500?

Here is what the site says about that.

From Pentax K-500: Pentax K-500: A DSLR by Pentax with a 16.3-megapixel APS-C sensor, announced in 2013. The K-50 without weather sealing. Specs - Maker: Pentax - Mount: Pentax K - Sensor: APS-C, 23.5 x 15.6mm, crop factor 1.5 - Resolution: 16.3 megapixels - Stabilisation: in the body - Announced: 2013 - Type: DSLR Focal lengths on it Lenses frame like 1.5 times their focal length on full frame: 16mm like 24mm, 23mm like 35mm, ...

From Your first camera: How to split the budget: Spend roughly as much on lenses as on the body, or more. A modest body with a great lens takes better pictures than a flagship body with a cheap zoom. A sensible first kit: 1. The body with its kit zoom, for everything. 2. A cheap fast prime, a 50mm f/1.8 or its APS-C equivalent, for people and low light. See lenses. 3. A spare battery and a decent memory ...

Quoted from this site's pages.