A rectangle with a length of 5 decimeters and a width of 3 decimeters can be surrounded by a piece of iron wire. What is the length of this wire in decimeters?
用一根铁丝正好能围成一个长为5分米，宽为3分米的长方形，这根铁丝长多少分米．
<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">8 * 2</gadget>
<output>16</output>

<result>16</result>