It is week 1 and there are currently 81 Apple Watches Series 6 in stock. We need 450 Apple Watches at the start of week 7. If there are scheduled receipts planned for week 3 of 72 Apple Watches and week 4 of 68 Apple Watches and Apple Watch has a lead time of 1 week, how much of an order should be placed to meet the requirement of Apple Watches? Input should be an exact number (for example, 5 or 10)