### Specific pricing based on quantity entered

Perhaps I'm not looking in the right place, so any help would be appreciated. I have a cart that needs to calculate a specific price based on a quantity entered off of a sliding scale for a class. A quantity of 1 is charged $2000, the second person on the order gets in for $750 (so total of 2750), then 3rd or more get in for 500 each (so 4 would be 2000+750+500+500). Any easy way to set this?

Thanks in advance!