A4. Three players are playing a game with chips. Each round, the player (or one of the players) with the most chips gives one chip to the pot and then one to each of the other players. The pot is initially empty, and the three players start with 13, 14, and 15 chips respectively. The game ends when one of the players has lost all their chips.

How many chips are in the pot when the game ends?
A) 36
B) 37
C) 38
D) 39
E) 40
A4. B) 37 After three rounds, everyone has lost 1 chip and 3 have landed in the pot. After $12 \cdot 3$ rounds, the players have 1, 2, and 3 chips left respectively, and there are 36 chips in the pot. In the next round, 1 more chip is added and the game ends.