There are 356 story books in the library, 78 of which were lent out today, and 44 were returned. How many story books are there in the library now?
图书室有故事书356本，今天借出78本，还回44本．现在图书室有故事书多少本．
<gadget id="calculator">356 - 78</gadget>
<output>278</output>

<gadget id="calculator">278 + 44</gadget>
<output>322</output>

<result>322</result>