A round-robin game is played with n players, that is, there is a game between any two players. The winner gets 2 points, the draw gets 1 point each, and the loser gets 0 points. After the game, the top 4 will get 8, 7, 5, 4 points in turn. n = how much.
n名棋手进行单循环比赛，即任两名棋手间都比赛一场．胜者得2分，平局各得1分，负者得0分．比赛完毕后，前4名依次得8、7、5、4分．n=多少．
<result>6</result>