Congcong’s family bought a new air conditioner, and his mother wants to make a cloth cover for this air conditioner (the bottom surface is not covered), what is the minimum number of decimeters of cloth needed? (The length of the air conditioner is 8dm, the width is 5dm, and the height is 20dm.)
聪聪家新买了一台空调，妈妈要给这台空调做一个布罩(下底面不罩)，最少需要用布多少分米？(空调长8dm，宽5dm，高20dm．)
<gadget id="calculator">8 * 5</gadget>
<output>40</output>

<gadget id="calculator">8 * 20</gadget>
<output>160</output>

<gadget id="calculator">5 * 20</gadget>
<output>100</output>

<gadget id="calculator">160 + 100</gadget>
<output>260</output>

<gadget id="calculator">260 * 2</gadget>
<output>520</output>

<gadget id="calculator">40 + 520</gadget>
<output>560</output>

<result>560</result>