A passenger train on the Beijing-Shanghai Line stops at 5 stations on the way (not including the origin and destination), and makes a round trip. How many different tickets do you need to prepare in total?
京沪线上某旅客列车在途中停靠5个车站(不包括起点和终点)，往返一次，共需要准备多少种不同的车票．
<gadget id="calculator">5 + 2</gadget>
<output>7</output>

<gadget id="calculator">7 * 6</gadget>
<output>42</output>

<result>42</result>