8 classes held a round-robin tug-of-war competition. Class 3 won the championship. How many games did Class 3 participate in? How many
8个班进行单循环赛制的拔河比赛，三班获得冠军，三班参加了多少场比赛？多少
<gadget id="calculator">8 - 1</gadget>
<output>7</output>

<result>7</result>