Master Li needs to produce 14,000 parts, and he can produce 600 per day. After 20 days of production, how many parts are left unfinished?
李师傅要生产14000个零件，他每天可以生产600个，生产20天后，还剩下多少个零件没有完成？
<gadget id="calculator">600 * 20</gadget>
<output>12_000</output>

<gadget id="calculator">14_000 - 12_000</gadget>
<output>2_000</output>

<result>2_000</result>