The Guangmei-Shantou Railway runs from Guangzhou East to Shantou, passing through 10 railway stations on the way. In order to meet the needs of passengers, the railway company must prepare at least how many different tickets for this railway line.
广梅汕铁路从广州东至汕头，途中经过10个火车站．为满足旅客的需求，该铁路公司至少要为这条铁路线准备多少种不同的车票．
<gadget id="calculator">12 - 1</gadget>
<output>11</output>

<gadget id="calculator">12 * 11</gadget>
<output>132</output>

<result>132</result>