Today Xiaoli read from page 9 to page 13, how many pages did Xiaoli read?
今天小丽从第9页读到第13页，请问小丽读了多少页？
<gadget id="calculator">13 - 9</gadget>
<output>4</output>

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

<result>5</result>