students participated in the table tennis competition. The competition adopts the elimination system, and one player is eliminated in each game. How many games will it take to decide the champion?
8个同学参加打乒乓球比赛．比赛采用淘汰制，每场比赛淘汰1人．到决出冠军时，要多少场？
<gadget id="calculator">4 + 2 + 1</gadget>
<output>7</output>

<result>7</result>