The school holds a table tennis competition. Group A and Group B each have 8 people. Each group competes in pairs. The loser is eliminated and the winner enters the next round. How many games are played in a group match?
学校举行乒乓球比赛，A组、B组两个小组各有8人，每组两人一对进行比赛，负者被淘汰，胜者进入下一轮，最后两组第一名进行决赛，两个小组赛一共进行多少场比赛．
<gadget id="calculator">8 - 1</gadget>
<output>7</output>

<gadget id="calculator">7 * 2</gadget>
<output>14</output>

<gadget id="calculator">14 + 1</gadget>
<output>15</output>

<result>15</result>