A rectangular vegetable field is 50 meters long and 30 meters wide, and one side is surrounded by a fence. How many meters should the fence be at least?
一块长方形菜地，长50米，宽30米，一面靠墙围上篱笆，篱笆至少要多少米？
<gadget id="calculator">30 * 2</gadget>
<output>60</output>

<gadget id="calculator">50 + 60</gadget>
<output>110</output>

<result>110</result>