There are five football teams A, B, C, D, and E in a single round-robin friendly match (every two teams play one game). In each game, the winning team gets 3 points, the losing team gets 0 points, and the draw teams get 1 point each. If the total points of teams A, B, C, and D are 1 point, 4 points, 7 points, and 8 points respectively, what is the minimum point for team E?
有A、B、C、D、E五个足球队进行单循环友谊赛(每两队赛一场)，每场比赛胜队得3分，负队得0分，平局两队各得1分．若A、B、C、D四队总分分别是1分、4分、7分、8分，那么E队至少得多少分．
<result>5</result>