A rectangular playground is 100 meters long and 50 meters wide. How many meters is the distance between Xiaoming's 3 laps and 1 kilometer?
一个长方形的操场，长100米，宽50米．小明跑3圈所行的路程与1千米相差多少米．
<gadget id="calculator">1 * 1_000</gadget>
<output>1_000</output>

<gadget id="calculator">100 + 50</gadget>
<output>150</output>

<gadget id="calculator">150 * 2 * 3</gadget>
<output>900</output>

<gadget id="calculator">1_000 - 900</gadget>
<output>100</output>

<result>100</result>