There are 905 story books in the school library, 268 were lent out last week, and another 188 were lent out this week. How many books are there in the library?
学校图书馆里有故事书905本，上周借出去268本，本周又借出去了188本，图书馆现在还有多少本书？
<gadget id="calculator">905 - 268 - 188</gadget>
<output>449</output>

<result>449</result>