Kobayashi runs around a rectangular square that is 200 meters long and 100 meters wide every day. How many meters does he run every day?
小林每天都绕一个长200米、宽100米的长方形广场跑一周，他每天跑多少米．
<gadget id="calculator">200 + 100</gadget>
<output>300</output>

<gadget id="calculator">300 * 2</gadget>
<output>600</output>

<result>600</result>