You have been given the task of transporting 3,000 apples 1,000 miles from appleland to bananaville. your truck can carry 1,000 apples at a time. every time you travel a mile towards bananaville you must pay a tax of 1 apple but you pay nothing when going in the other direction (towards appleland).
what is highest number of apples you can get to bananaville?

If the truck can carry 1000 apples at a time, Bananaville is 1000 miles away from Appleland and you pay one apple per mile, then it's impossible to deliver any apple to Bananaville, because on 1000 miles you'll pay 1 apple * 1000 miles = 1000 apples as a tax. So no matter if you go once, twice, three times or a hundred times there - you'll be never able to deliver any apple.

The highest number of apples you can get to Bananaville is 0.