Xiaomin queues up after school. He is the 5th from the front to the back, and the 7th from the back to the front. How many classmates are there in this row?
小民放学排队上阵，从前往后数他是第5个，从后往前数是他是第7个，这一排一共有多少个同学？
<gadget id="calculator">7 - 1</gadget>
<output>6</output>

<gadget id="calculator">5 + 6</gadget>
<output>11</output>

<result>11</result>