Four children, A, B, C, and D, play a chess game. No two of them play a game. It is stipulated that the winner gets 3 points, the tie gets 1 point, and the loser gets 0 points. As a result, D gets 6 points, B gets 4 points, and C gets 2 points, so how many points does A get?
甲、乙、丙、丁4个小朋友进行象棋比赛，没两个都比赛一场，规定胜者得3分，平局得1分，输者得0分．结果丁得6分，乙得4分，丙得2分，那么甲得多少分．
<gadget id="calculator">12 - 6 - 4 - 2</gadget>
<output>0</output>

<result>0</result>