Deploy to batch of computers problem

Deploy to batch of computers problem

I bought 300 OS deployment licenses that I want to use over 3 year.
I created a deployment task with name pattern and auto start when 1 computer is ready.

The task stops running after successful deployment and the computer has the correct name.

Now the problem is that when I start the task again for a new computer the name pattern starts back at the begin.
It needs to go up sequentially.

How to achieve this?