Split Tree Problem

Hello,

I'm using the split component to get a single branch from a tree:

in the mask list i write:

{0;0;0;25} to get the last branch (25 in this case)

But I don't know yet what will be the last number and I don't want to change it manually afterwards.

So how I tell to use always the last branch? So if I increase the value to 50 afterwards it changes automatically?

I hope I made myself clear,

Ivan