Uncle Wang surrounded a rectangular vegetable field with a fence against the wall. The length of this vegetable field is 7 meters and the width is 5 meters. What is the minimum length of fence required to enclose this vegetable field?
王大爷用篱笆靠墙围一块长方形菜地．这块菜地的长7米，宽5米，围成这块菜地至少需要多少米长的篱笆？
<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">7 + 10</gadget>
<output>17</output>

<result>17</result>