Master Wang needs to process 200 parts. Yesterday he processed 56 parts, and today he processed 73 parts. How many parts are left unprocessed?
王师傅要加工200个零件，昨天已经加工了56个，今天又加工了73个，还剩多少个没有加工？
<gadget id="calculator">200 - 56 - 73</gadget>
<output>71</output>

<result>71</result>