Ben is stocking milk at the local JumboMart. The milk cooler holds 780 cartons of milk and is completely full when Ben starts his shift. The store sells 75 percent of the milk during the first hour that Ben works and then sells another 20 percent of the remaining milk during the second hour. If there are 1000 cartons of milk in the back room, how many of them will Ben not need in order to restock the milk cooler?