There are 44 people in the class lined up, the 11th from the left is Xiaohong, and the 13th from the right is Xiaofen, how many classmates are there between Xiaohong and Xiaofen?
全班44人排成一行，从左起第11名是小红，从右起第13名是小芬，小红和小芬之间有多少个同学．
<gadget id="calculator">44 - 11 - 13</gadget>
<output>20</output>

<result>20</result>