A, B, and C play a round-robin chess match. The winner gets 2 points, the loser gets 0 points, and the draw gets 1 point each. How many situations are there for the three people to score?
甲、乙、丙三人进行象棋循环赛，规定胜者得2分，败者得0分，平局各得1分．则三人的得分共有多少种情况．
<gadget id="calculator">3 + 0</gadget>
<output>3</output>

<gadget id="calculator">4 + 0</gadget>
<output>4</output>

<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<gadget id="calculator">3 + 4 + 5 + 4 + 3</gadget>
<output>19</output>

<result>19</result>