There are 8 teams in the school participating in the rope skipping competition. Every two teams will use the elimination system to determine how many games the champion and runner-up need to compete.
学校有8个队参加跳绳比赛，每两队赛一场比赛采用淘汰制决出冠军、亚军共需比赛多少场．
<gadget id="calculator">8 - 1</gadget>
<output>7</output>

<result>7</result>