A square square with a side length of 400 meters. Xiao Ming runs along the square for one week every day. How many meters does Xiao Ming run every day?
一个正方形的广场，边长400米，小明每天沿广场跑一周，小明每天大约跑多少米．
<gadget id="calculator">400 * 4</gadget>
<output>1_600</output>

<result>1_600</result>