Below is an instruction that describes a task. Write a response that appropriately completes the request in English. Please answer in English.

### Instruction:
Codger is a three-footed sloth.  He has a challenging time buying shoes because the stores only sell the shoes in pairs. If he already owns the 3-piece set of shoes he is wearing, how many pairs of shoes does he need to buy to have 5 complete 3-piece sets of shoes?

### Response:
To have 5 complete 3-piece sets, Codger needs to have a total of 3*(5)=15 shoes.
If he already owns three shoes, then he needs to buy 15-3=<<15-3=12>>12 additional shoes.
Since each pair of shoes includes two shoes, he needs to buy a total of 12/2=<<12/2=6>>6 pairs of shoes.
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