rectangular garden with a length of 40 meters and a width of 10 meters. Xiao Lin ran 4 laps along the garden. How many meters did he run at least?
一个长40米，宽10米的长方形花园，小林沿这个花园跑了4圈，他至少跑了多少米？
<gadget id="calculator">40 + 10</gadget>
<output>50</output>

<gadget id="calculator">50 * 2 * 4</gadget>
<output>400</output>

<result>400</result>