In order to beautify the campus environment and protect the greenery, the school plans to build a bamboo fence around the 80-meter-long and 45-meter-wide greenbelt. How long do you think the bamboo fence needs?
学校为美化校园环境，保护绿地花草，计划在长80米，宽45米的绿地四周围上竹篱笆，你看得需要多长的竹篱笆？
<gadget id="calculator">80 + 45</gadget>
<output>125</output>

<gadget id="calculator">125 * 2</gadget>
<output>250</output>

<result>250</result>