Changing size of surface when adding points

Hello,

For my project were I am using Grasshopper for the first time, I have to design a busstop.
The problem I am having at this point is that I want to design it according to the amount of people that are standing in the busstop. For this I have made a rectangluar surface with two sides of different lenghts, and on this surface I can change the amount of random points (amount of persons). When increasing or decreasing the amount of random points I want Grasshopper to change the size of the length and width of the surface automatically.

For example, I have 3 persons (points) standing on the surface, Grasshopper must be changing the size automatically to 3 m2. So this can be a rectangluar surface of 1 by 3 m2, or 2 by 1,5 m2 etc.
How do I construct something like this? Thank you in advance!