A rectangular square is 300 meters long and 78 meters wide. Kobayashi runs around the square twice a day. How many meters did he run in total in April?
一个长方形的广场，长300米，宽78米，小林每天沿广场跑两圈，他4月大约共跑多少米．
<gadget id="calculator">300 + 78</gadget>
<output>378</output>

<gadget id="calculator">378 * 2 * 30</gadget>
<output>22_680</output>

<result>22_680</result>