The train goes from A to B, and stops at 5 stations (not including A and B). How many types of tickets are prepared by the railway department?
火车从A地到B地，中间停靠5个车站(不包括A、B两站)，铁道部门共准备多少种车票？
<gadget id="calculator">5 + 2</gadget>
<output>7</output>

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

<gadget id="calculator">2 * 1</gadget>
<output>2</output>

<gadget id="calculator">42 / 2</gadget>
<output>21</output>

<result>21</result>