Uncle Huang surrounded a rectangular vegetable field with a length of 23 meters and a width of 15 meters with a windshield fence. One of them is long against the wall and does not need to be fenced. How many meters is the windshield fence for the vegetable garden?
黄大叔给长23米，宽15米的长方形菜地围上挡风篱笆．其中有一条长靠墙不用围，请问菜园的挡风篱笆长多少米？
<gadget id="calculator">15 * 2</gadget>
<output>30</output>

<gadget id="calculator">23 + 30</gadget>
<output>53</output>

<result>53</result>