Between Wuhan and Beijing, the high-speed train has to stop at 7 stations on the way, and the fares between the two stations are different. So how many different fares are there from Wuhan to Beijing?
武汉到北京之间，动车中途还要停靠7个车站，相互两站间的票价都不一样．那么武汉到北京共有多少种不同的票价．
<gadget id="calculator">9 - 1</gadget>
<output>8</output>

<gadget id="calculator">8 * 9</gadget>
<output>72</output>

<result>72</result>