Some of my father's friends came to Xiao Yuan's house, and my mother asked him to boil water and make tea for the guests. It takes 3 minutes to wash tea sets (including teacups and teapots), 2 minutes to wash a kettle, 10 minutes to boil water, and 5 minutes to buy tea leaves. Please calculate how many minutes it will take Xiao Yuan to get the guests to drink tea as soon as possible.
小元家来了爸爸的几个朋友，妈妈让他给客人烧水沏茶．洗茶具(包括茶杯和茶壶)需要3分钟，洗开水壶需要2分钟，烧开水需要10分钟，买茶叶需要5分钟．请你算一下，小元至少花多少分钟才能尽快让客人喝上茶．
<gadget id="calculator">2 + 10</gadget>
<output>12</output>

<result>12</result>