Five players compete in a chess match, and every two players have to play a game. It is stipulated that players will get 2 points for a win, 1 point for each game on average, and no points for a loss. It is known that after the game, 4 of the players scored a total of 16 points, how many points did the 5th player get?
5位选手进行象棋比赛，每两个人之间都要进行比赛一盘，规定选手胜一盘得2分，平均一盘各得一分，输一盘不得分．已知比赛后，其中4位选手总共得16分，则第5位选手得了多少分．
<gadget id="calculator">20 - 16</gadget>
<output>4</output>

<result>4</result>