The stationery store sold 252 boxes of chalk on the first day, and sold 78 more boxes on the second day than on the first day. How many boxes were sold in total in the two days?
文具商店第一天卖了252盒粉笔，第二天比第一天多卖78盒，两天共卖出了多少盒？
<gadget id="calculator">252 + 78 + 252</gadget>
<output>582</output>

<result>582</result>