In order to celebrate New Year's Day, we need to decorate the classroom. The blackboard in the classroom is 3 meters long and 2 meters wide. It is necessary to put garland around the blackboard. Please calculate how long the garland needs to be on this blackboard?
为了庆祝元旦节需要装饰教室．教室的黑板长3米，宽2米，要给黑板四周贴上拉花，请你算一算这块黑板需要多长的拉花呢？
<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<result>10</result>