Yangzhou's special products in the Slender West Lake service area include: "Green Leaf Brand" brown sugar, "Sanhe Simei" pickles, and three-packs. If Wang Bing buys at least one type, he can buy up to three types. How many different plans are there for buying specialty products?
瘦西湖服务区扬州的特产有："绿叶牌"牛皮糖、"三和四美"酱菜、三丁包，如果王兵最少买1种，最多买3种．一共有多少种不同的买特产方案．
<gadget id="calculator">3 + 3 + 1</gadget>
<output>7</output>

<result>7</result>