The factory processes a batch of parts. It has been processing for 3 days, 216 parts are processed every day, and there are still 159 parts left to complete the task. How many parts are there in total?
工厂加工一批零件，已经加工了3天，每天加工216个，还差159个完成任务．这批零件一共有多少个？
<gadget id="calculator">216 * 3</gadget>
<output>648</output>

<gadget id="calculator">648 + 159</gadget>
<output>807</output>

<result>807</result>