The school library originally had 4,580 books, 209 of which were damaged and cleared out. Students donated another 1,049 books on Children’s Day. How many books are there in the school?
学校图书室原有藏书4580册，有209册破损清除了，六一儿童节时同学们又补捐了1049册，学校现有图书多少册？
<gadget id="calculator">4_580 - 209</gadget>
<output>4_371</output>

<gadget id="calculator">4_371 + 1_049</gadget>
<output>5_420</output>

<result>5_420</result>