There are 724 books in the school library, first-grade students borrowed 88 books, second-grade students borrowed the remaining half, and the remaining half was divided equally between the third, fourth, and fifth grades. How many books did the fourth grade students borrow?
学校图书馆有724本书，一年级同学借走88本，二年级同学借走剩下的一半，剩下的另一半平均分给三、四、五这三个年级．四年级同学借到多少本书？
<gadget id="calculator">724 - 88</gadget>
<output>636</output>

<gadget id="calculator">636 / 2 / 3</gadget>
<output>106</output>

<result>106</result>