The train from Beijing to Fuzhou has 9 stops in total. There are several different fares for this train.
从北京到福州的火车，中间一共要停靠9站，这趟列车一共有几种不同的票价多少．
<gadget id="calculator">10 + 9 + 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1</gadget>
<output>55</output>

<result>55</result>