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JBMO 2024 Problem 4

  • Paper

Three friends Archie, Billie and Charlie play a game. At the beginning of the game, each of them has a pile of 2024 pebbles. Archie makes the first move, Billie makes the second, Charlie makes the third and they continue to make moves in the same order. In each move, the player making the move must choose a positive integer nn greater than any previously chosen number by any player, take 2n2n pebbles from his pile and distribute them equally to the other two players. If a player cannot make a move, the game ends and that player loses the game.

Determine all the players who have a strategy such that, regardless of how the other two players play, they will not lose the game.

Official text Junior Balkan Mathematical Olympiad 2024 official paper, page 1. Quoted with source.

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