Five Mercedes E550 vehicles are shipped to a local dealership. The dealer sells one E550 in any week with probability 0.3 and otherwise sells none in that week. When all E550s in stack have been sold, the dealer requests a new shipment of ve such cars, and it takes 1 week for that delivery to occur. Let Xn = the number of Mercedes E550s at this dealership n weeks after the initial delivery of ve cars.