A rectangular vegetable field is 9 meters long and 5 meters wide. One side of the long side is against a wall. A fence needs to be surrounded on the other three sides. What is the length of the fence?
一块长方形菜地，长是9米，宽是5米，长边有一面靠墙，要在另外三面围上篱笆，篱笆的长是多少？
<gadget id="calculator">5 * 2</gadget>
<output>10</output>

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

<result>19</result>