Five empty bottles, four lids can be exchanged for three bottles of beer, and there is one lid left. There are three empty bottles and four lids after drinking. You can change two more bottles of beer and leave an empty bottle. There are three empty bottles and two lids after drinking. Two empty bottles were changed 1 bottle of beer. After drinking, there are two empty bottles and three lids. Two empty bottles were exchanged for 1 bottle of beer. After drinking, there were 1 empty bottles and five lids. 1 bottle of beer uses 4 caps. After drinking, there are two empty bottles and two caps. Two empty bottles were changed 1 bottle of beer. After drinking, there are 1 empty bottles and three caps. I drank 14 bottles of beer here.

But at this time, if you drink a bottle on credit first, there will be two empty bottles and four lids. You only need to exchange 2 bottles of beer for 1 bottle on credit, or you can drink 1 bottle. Finally, there is 1 bottle 1 lid, which cannot be replaced.

So, you can drink: 16 bottles of beer.