On October 1, 2009, the 60th anniversary of the founding of the People's Republic of China, how many years will it be when the 80th anniversary of the founding of the People's Republic of China?
2009年10月1日，中华人民共和国成立60周年，当中华人民共和国成立80周年时是多少年．
<gadget id="calculator">80 - 60</gadget>
<output>20</output>

<gadget id="calculator">2_009 + 20</gadget>
<output>2_029</output>

<result>2_029</result>