The stationery store sold 252 boxes of pens on the first day, and 78 boxes less on the second day than on the first day. How many boxes were sold in total in the two days?
文具店第一天卖出了252盒笔，第二天比第一天少78盒，两天一共卖出多少盒？
<gadget id="calculator">252 - 78</gadget>
<output>174</output>

<gadget id="calculator">174 + 252</gadget>
<output>426</output>

<result>426</result>