There were 420 people visiting the old site of Dadian Provincial Government in the morning, and another 63 people came at noon. How many people are visiting now? 
大店省政府旧址上午有420人参观，中午又来了63人，现在有多少人在参观？
<gadget id="calculator">420 + 63</gadget>
<output>483</output>

<result>483</result>