18 basketball teams participate in the competition, adopt the elimination system, and finally determine the champion. How many games will be arranged in total?
18支篮球队参加比赛，采用淘汰制，最后决出冠军，一共要安排多少场比赛？
<gadget id="calculator">18 - 1</gadget>
<output>17</output>

<result>17</result>