There are 8 basketball teams participating in the competition, and the competition is conducted in a single elimination system. How many games will be played in total to produce a champion.
有8只篮球队参加比赛，比赛以单场淘汰制进行．一共要进行多少场比赛后才能产生冠军．
<gadget id="calculator">8 - 1</gadget>
<output>7</output>

<result>7</result>