The train between Nanjing and Beijing has to go through 6 stations. How many different hard-seat tickets will the railway bureau prepare for the train running between Nanjing and Beijing?
往返于南京、北京的火车中途要经过6个站，铁路局要为南京和北京之间运行的火车准备多少种不同的硬坐车票？
<gadget id="calculator">6 + 2</gadget>
<output>8</output>

<gadget id="calculator">8 - 1</gadget>
<output>7</output>

<gadget id="calculator">8 * 7</gadget>
<output>56</output>

<result>56</result>