Naughty wants to surround a rectangular fence with a wall, which is 9 meters long and 5 meters wide. How many meters is the shortest fence? How many
淘气要靠墙围一个长方形篱笆，长9米，宽5米，篱笆最短需要多少米？多少
<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">9 + 10</gadget>
<output>19</output>

<result>19</result>