Parametric formulas

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Hi there !
I am hoping someone can help me figure out something I am working with.
I am making a file for a ladder design. The ladders are going to be used for reaching loft beds or bunk beds.
I would like to be able to design something that can allow me make shorter or taller laders.
I am therefore using parameters. But I am encountering a problem when it comes to drawing the steps.
To keep it not too complicated I would like to keep the same distance between each steps but since the height of the ladder might change, I might end up needing more or less steps.
I probably need a formula for that so I was thinking perhaps someone can send me info on the type of formulas I could possibly use there.
The way I thought about designing that is that I basically make a sketch and on the sketch is defined (by my parameters - and therefore by the height of the ladder) how many steps I need (so how many circles are drawn on my sketch). And then from that sketch I will create the extrusions. But perhaps you'd have a better advice.
I can already see a problem if for instance the first ladder I make is let's say 2000mm and has 9 steps. If I extrude the 9 circles I get from my sketch, then I might get an error message if after that, I want to shrink my ladder to 1500mm and have 6 step (giving random numbers, but I hope you follow). Then I will have 3 extrusion operations whose sketch will no longer exist.
Does that make sense?
Would you have some advice on how I can design this best.
Many thanks in advance !
Best
Olivia