Thirsty Dave has his fill

Thirsty Dave had a great night last night. He was telling us that he got 5 free sandwiches. We were intrigued and asked him to explain how he received not 1,2,3 or 4 but 5 free sandwiches. At the best of times Thirsty Dave doesn’t make a lot of sense. This is mainly due to the copious amounts of alcohol coursing through his veins. After 20 minutes of the most bizarre explanation imaginable, he produced the following piece of paper which explained everything: