[dwd]

Have you tried writing it out on paper as a flowchart? Sounds old school, but can help with visualising what's happening.

Loops become super simple when you see them as series of steps with a yes/no question of whether to stop or go through your steps again.

Draw up some boxes for every variable you think you're going to need, give them labels and add the labels to the flowchart.

This then allows you to run through the flowchart step by step changing the values in each box as you go.