[Closed] Self-reference problem

Hi,
I would like to make a scale controller for my node, but I have a simple problem. I don’t want to decrease scale of my node, so let’s say that distance from [0,0,0] determines my scale and if i move my object away from [0,0,0] it grows, but when I move it closer to the [0,0,0] it shouldn’t decrease its scale, so I need to do something like

if current_scale < (distance node [0,0,0]) then return (distance node [0,0,0]) else return current_scale

but I don’t know how to get the current scale, it makes Self-reference error. Any ideas?