The road builders want to build a new road with a length of 1 kilometer. They completed 436 meters in the first month and 389 meters in the second month. How many meters must be completed in the third month?
筑路工人要新建一条长1千米的马路，第一个月完成了436米，第二个月完成了389米，第三个月还要完成多少米才能完工？
<gadget id="calculator">1 * 1_000</gadget>
<output>1_000</output>

<gadget id="calculator">1_000 - 436 - 389</gadget>
<output>175</output>

<result>175</result>