The school library originally had 458 books, 209 of which were damaged and cleared out. Students donated another 149 books on Children’s Day. How many books does the school have?
学校图书室原有藏书458册，有209册破损清除了，六一儿童节时同学们又补捐了149册，学校现有图书多少册？
<gadget id="calculator">458 - 209</gadget>
<output>249</output>

<gadget id="calculator">249 + 149</gadget>
<output>398</output>

<result>398</result>