There are four teams A, B, C, and D participating in a football round-robin match. Every two teams have to play one game. The winner gets 3 points, the loser gets 0 points, and if the tie is tied, both teams get 1 point each. Now A, B, and C have scored 7 points, 1 point, and 6 points respectively. It is known that A and B are tied, so how many points does D get?
有甲、乙、丙、丁四支球队参加的足球循环赛，每两队都要赛一场，胜得3分，负者得0分，如果踢平，两队各得1分．现在甲、乙、丙分别得了7分、1分和6分，已知甲和乙踢平，那么丁得多少分．
<result>3</result>