There are 16 football teams participating in the competition, and the competition is conducted in a single-elimination system (that is, one team is eliminated in each game). How many games will be played in total to produce a champion.
有16支足球队参加比赛，比赛以单场淘汰制(即每场比赛淘汰一支球队)进行．一共要进行多少场比赛后才能产生冠军．
<gadget id="calculator">16 - 1</gadget>
<output>15</output>

<result>15</result>