will rate quick

A store purchase a product from its manufacturer. Following a long-term contract, the store always request the manufacturer to send a shipment of 2,187 units regularly. The manufacturer always deliver a shipment exactly 7 days after receiving a replenishment order from the store. The daily demand of the product is constant at 27 units per day. Suppose a new shipment has just arrived in the store at the beginning of day 1 and the beginning inventory on day 1 becomes 2,187 units. Assume that the store always place an order at the end of day while a shipment always arrive at the beginning of day. What is the inventory level at the end of day 23