Xiao Ming wants to help his mother do the following things on weekends: it takes 20 minutes to wash clothes with the washing machine; 8 minutes to sweep the floor; 13 minutes to wipe the furniture; 5 minutes to dry the clothes. She has made reasonable arrangements, how many minutes it will take at least to finish these things.
小明双休日想帮妈妈做下面的事情：用洗衣机洗衣服要用20分钟；扫地要用8分钟；擦家具要用13分钟；晾衣服要用5分钟．她经过合理安排，做完这些事至少要花多少分钟．
<gadget id="calculator">13 + 8 + 5</gadget>
<output>26</output>

<result>26</result>