Li Ming is in the queue, there are 5 children in front of him, and the number of children behind him is twice the number of the front. How many people are there in this row?
李明排在队伍中，他前面有5个小朋友，排在他后面的人数是前面人数的2倍．这一排队伍共多少人．
<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">10 + 5 + 1</gadget>
<output>16</output>

<result>16</result>