A canal is 3 kilometers long, and it is planned to be completed in 3 days. On the first day, 220 meters will be repaired, and on the second day, 780 meters will be repaired. How many meters will be repaired on the third day?
一条水渠长3千米，计划3天修完，第一天修220米，第二天修780米，第三天修多少米？
<gadget id="calculator">3 * 1_000</gadget>
<output>3_000</output>

<gadget id="calculator">3_000 - 220 - 780</gadget>
<output>2_000</output>

<result>2_000</result>