ISL 2010 C4
Six stacks of coins are standing in a row. In the beginning every stack contains a single coin. There are two types of allowed moves: Move 1: If stack with contains at least one coin, you may remove one coin from and add two coins to . Move 2: If stack with contains at least one coin, then you may remove one coin from and exchange stacks and . Decide whether it is possible to achieve by a sequence of such moves that the first five stacks are empty, whereas the sixth stack contains exactly coins. Same as Problem C4, but the constant is replaced by . (Netherlands)
Dataset text NuminaMath olympiads. Quoted with source.
Official text: IMO 2010 Shortlist booklet, page 31.
Solutions
Official solution Solution 1 by the IMO Problem Selection Committee
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