Xiaoli walked 1 kilometer and 500 meters from her home to the park. How many meters did she walk back and forth?
小丽从家去公园走了1千米又500米，她来回共走了多少米．
<gadget id="calculator">1 * 1_000</gadget>
<output>1_000</output>

<gadget id="calculator">1_000 + 500</gadget>
<output>1_500</output>

<gadget id="calculator">1_500 * 2</gadget>
<output>3_000</output>

<result>3_000</result>