There is a rectangular vegetable field, its width is 28 meters, and its length is 13 times its width. A fence is built around this vegetable field. How long is the fence?
有一块长方形的菜地，它的宽是28米，长是宽的13倍，在这块菜地的四周围上篱笆，篱笆长多少米？
<gadget id="calculator">28 * 13</gadget>
<output>364</output>

<gadget id="calculator">364 + 28</gadget>
<output>392</output>

<gadget id="calculator">392 * 2</gadget>
<output>784</output>

<result>784</result>