Your neighborhood grocery store, Wow Grocery, always seems to be running out of your favorite ice cream. In frustration, you ask the store manager why they always seem to be out. The store manager, Bob, tells you that the small store cannot afford an inventory management system, so inventory is updated manually. This means that oftentimes the store must either stock extra quantities of well-liked items or risk running out. Unfortunately, Wow Grocery does not have a large enough freezer to store additional stocks of ice cream. As a result, the store runs out of the ice cream quite frequently.