A pencil has two different specifications: 3 packs and 5 packs. Mr. Wu wants to buy 38 pencils. How many different purchase plans can you choose? (list answer)
一种铅笔有3支装和5支装两种不同的规格，吴老师要购买38支铅笔，那一共有几种不同的购买方案可以选择？(列表解答)
<result>3</result>