The "Green Homeland" display board is 24 decimeters long and 19 decimeters wide. What is its perimeter?
"绿色家园"展牌长24分米，宽19分米，它的周长是多少分米？
<gadget id="calculator">24 + 19</gadget>
<output>43</output>

<gadget id="calculator">43 * 2</gadget>
<output>86</output>

<result>86</result>