Deleting a number of points Graph mapper

Hi, I’m new to the grasshopper and tried to create a series of dots with a gradual decrease in their number to the top.
Any ideas on how to solve this?I tried to experiment with graph mapper, but without success.
Your help is much appreciated!

11.3dm (22.9 KB) (8.4 KB)

Something like this? (13.0 KB)

Thanks for your help. This is exactly what I need.)