Students line up to do exercises. Xiao Ming is 6th from the front and 7th from the back. How many people are there in this row?
同学们排队做操，小明从前数是第6，从后数是第7，这一列共有多少人人．
<gadget id="calculator">7 - 1</gadget>
<output>6</output>

<gadget id="calculator">6 + 6</gadget>
<output>12</output>

<result>12</result>