There is a door frame with a height of 20 decimeters and a width of 6 decimeters. To make 4 such door frames, at least how many decimeters of wooden strips should be used?
有一个门框，高20分米，宽6分米，制作4个这样的门框，至少要用木条多少分米？
<gadget id="calculator">20 + 6</gadget>
<output>26</output>

<gadget id="calculator">26 * 2 * 4</gadget>
<output>208</output>

<result>208</result>