Add-on Display number of threads which are closed on the node_forum_level_2 template

[Sonam]

Hey!

I would like an Addon which gives out the number of not closed threads in a forum.
Example:
I have 10 threads in the forum and 6 of them are closed, I now want to show 4 (10-6) on the node_forum_level_2 template. (small payment if needed)

Thanks!