Teacher Li has to walk 1,000 meters from home to school. Once, she walked 250 meters to class, then went home to get teaching aids, and then went to school. How many meters did Teacher Li walk to school this time?
李老师从家里到学校要走1000米，有一次，她去上课走了250米，又回家取教具，再去学校，这一次李老师去学校共走了多少米．
<gadget id="calculator">250 * 2</gadget>
<output>500</output>

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

<result>1_500</result>