Five children A, B, C, D, and E are playing a chess game, and each two players will play one game. So far, A has played 4 games, B has played 3 games, C has played 2 games, and D has played 1 game. How many games has E played?
A、B、C、D、E五位小朋友之间进行象棋比赛，每两个人都要比赛一场．到现在为止，A赛了4场，B赛了3场，C赛了2场，D赛了1场，那么E赛了多少场．
<result>2</result>