4 representative teams participate in the two-elimination football championship. In this tournament, each team loses two games and is eliminated. Ask at least how many games are needed to determine the champion.
4个代表队参加两次淘汰制足球锦标赛．在这种锦标赛中，每一队输两场比赛就被淘汰出局．问至少需要进行多少场比赛才能决出冠军．
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<result>6</result>