In a square square with a side length of 50 meters, Dong Xiaojie runs 4 laps every day, how many meters does he run every day?
正方形的广场，边长50米，董小洁每天跑4圈，每天跑多少米．
<gadget id="calculator">50 * 4 * 4</gadget>
<output>800</output>

<result>800</result>