Cull Nth: start to remove at 0

Hey all!

I have a problem. I would like to use the "CullN"-command, to remove every Nth branch. My problem is that grasshopper starts to remove with the item 1. But at the end I would like to extract the branches 0,2,4,... (also every even number including zero; look at the picture below). If I like to extract all the even number from a list of items. I shift the lift first and then ich use the "CullN"-command. Is there a possibility to shift branches? Or do you konw an other way to solve this problem?

Thanks

Bonobert