There is a rectangular nursery with a length of 3 meters and a width of 2 meters. One side is against the wall, and the other three sides are surrounded by bamboo fences. How many meters of bamboo fences are needed at least?
有一个长方形苗圃，长是3米，宽是2米，一面靠墙，其他三面围上竹篱笆，至少需要竹篱笆多少米？
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">3 + 4</gadget>
<output>7</output>

<result>7</result>