A square nursery has a side length of 300 meters. It is necessary to surround it with a fence (not counting the joints). What is the minimum length of the fence?
一个正方形苗圃，边长是300米，要在它的周围围上篱笆(接头处不计)，篱笆至少长多少米？
<gadget id="calculator">300 * 4</gadget>
<output>1_200</output>

<result>1_200</result>