The TV factory needs to produce 1,000 TV sets, and 215 sets are produced every day. It has been produced for 4 days. How many sets are still left?
电视机厂要生产1000台电视机，每天生产215台，已经生产了4天，还有多少台没有生产？
<gadget id="calculator">215 * 4</gadget>
<output>860</output>

<gadget id="calculator">1_000 - 860</gadget>
<output>140</output>

<result>140</result>