A small square square with a side length of 100 meters. Xiaolin runs around the square every day, about how many meters he ran.
一个小型正方形广场，边长是100米，小林每天沿着广场跑一圈，大约跑了多少米．
<gadget id="calculator">100 * 4</gadget>
<output>400</output>

<result>400</result>