Uncle Wang wants to surround a small vegetable garden with a length of 5 meters and a width of 2 meters against the wall. At least how many meters of fence should be prepared.
王大爷想靠墙围一个长5米，宽2米的小菜园，至少要准备多少米的篱笆．
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">5 + 4</gadget>
<output>9</output>

<result>9</result>