Four classes in the third grade have a tug-of-war competition. If the teams meet, how many games will there be in total?
三年级4个班进行拔河比赛，如果队队见面，一共要进行多少场比赛．
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">4 / 2</gadget>
<output>2</output>

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

<result>6</result>