A parallelogram billboard, the lengths of the two adjacent sides are 140 cm and 80 cm, now we need to put ribbons around the billboard, how long is the ribbon?
一个平行四边形的广告牌，相邻两边的长度是140厘米和80厘米，现在要在广告牌的四周围上彩带，彩带长多少？
<gadget id="calculator">140 + 80</gadget>
<output>220</output>

<gadget id="calculator">220 * 2</gadget>
<output>440</output>

<result>440</result>