Adding Extra Servers in Waiting Line

[RatherConfuzed]

Hi guys, thanks to the people who replied to my previous issues. I have put together most of my excel document but now I need to work out how to add an extra two servers.

The Simulation is of a gas station and I have got it mostly working with One server but now I need to add two more - how would I go about doing this yet still getting it to calculate all the formulae correctly? I've attached what I have done to this

Any help would be greatly appreciated as I have officially hit a wall.

Thanks!!

Oh yeah I have an issue with Wait Time aswell where I can't get it to read 0 if no one is waiting.