In the physical education class, the students ran 4 laps around the rectangular playground. It is known that the length of the playground is 100 meters and the width is 25 meters. How many meters did the students run?
体育课上，同学们围着长方形的操场跑了4圈，已知操场的长为100米，宽为25米，同学们跑了多少米？
<gadget id="calculator">100 + 25</gadget>
<output>125</output>

<gadget id="calculator">125 * 2 * 4</gadget>
<output>1_000</output>

<result>1_000</result>