There are 5 stations from A to B. How many different tickets do you need to prepare for a one-way trip?
A地到B地共有5个车站，单程需要准备多少种不同的车票．
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">4 * (5/2)</gadget>
<output>10</output>

<result>10</result>