The library of Dongqiao Primary School originally had 1,800 books, 280 were lent out during the winter vacation, and 224 were returned after school started. How many books are there in the library?
东桥小学图书室原有图书1800本，寒假期间借出280本，开学后还回来224本，图书室现有图书多少本？
<gadget id="calculator">1_800 - 280</gadget>
<output>1_520</output>

<gadget id="calculator">1_520 + 224</gadget>
<output>1_744</output>

<result>1_744</result>