A, B, C, and D each play a ball game. It is known that A has won 3 games and B has won 1 game. What is the maximum number of games that C can win?
甲、乙、丙、丁四人每两人打一场球赛，已知甲胜了3场，乙胜了1场，那么丙最多胜多少场．
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<gadget id="calculator">6 - 4</gadget>
<output>2</output>

<result>2</result>