Axis pattern value as parameter

Hello

I have created an extrude feature and cut a hole on it.Now, I would like to create axis pattern for a hole feature. I am able to set angle value as driven by parameter.I would like to make number of items also a parameter driven.

It's not allowing me to update relation for number of items. Any thought on this would be helpful. Please refer attached image for reference. I am trying to provide real number parameter and having value is 20.

Thanks and Regards

Ketan