A passenger transportation company has 5 stations on the way from A to B, and the ticket price of each station is different. How many kinds of fares are there in total from A to B?
某客运公司甲地到乙地途中设有5个站点，每个站点的票价各不相同，从甲地到乙地一共有多少种票价．
<gadget id="calculator">6 + 5 + 4 + 3 + 2 + 1</gadget>
<output>21</output>

<result>21</result>