Lili helps her mother with housework, washing rice for 2 minutes, washing vegetables for 5 minutes, cooking for 10 minutes, cooking for 20 minutes, and serving for 1 minute. How long does it take to finish these chores?
丽丽帮妈妈做家务，淘米2分钟，洗菜5分钟，炒菜10分钟，煮饭20分钟，盛饭1分钟．做完这些家务至少需要多少时间？
<gadget id="calculator">2 + 20 + 1</gadget>
<output>23</output>

<result>23</result>