12 athletes participate in the table tennis singles competition. The competition adopts a single elimination system. How many games will it take to determine the champion.
12名运动员参加乒乓球单打比赛，比赛采用单场淘汰制，要比赛多少场才能决出冠军．
<gadget id="calculator">12 - 1</gadget>
<output>11</output>

<result>11</result>