Hello and welcome to the forum,
Posting "it is not working" provides nothing for us to use to help you.
You need to post any diagnostic info or explain the undesired results.
In addition to mentioning what the actual problem is, posting your variables and the statement with the NUMVAl will also help us help you. When posting program code, jcl, data, etc., use the "Code" tag to preserve slignment and improve readability. Use Preview to see your post as it will appear to the forum then Submit when the post is as you want it.
Hope this helps,