On Saturday, Lili does housework at home. It takes 8 minutes to tidy up the room, 20 minutes to boil water, 12 minutes to wash clothes, and 1 minute to make tea. How many minutes does it take Lili to finish these housework at least?
星期六，丽丽在家做家务．整理房间要8分钟，烧开水要20分钟，洗衣服要12分钟，泡茶要1分钟，丽丽做完这些家务最少需要多少分钟．
<gadget id="calculator">20 + 1</gadget>
<output>21</output>

<result>21</result>