RU-ALLRUSSIAN 2018 Problem 115
- Grade 11
On the table, there're cards arranged on a circle. On each card, a positive integer was written so that all numbers are distinct. First, Vasya selects one of the card, remove it from the circle, and do the following operation: If on the last card taken out was written positive integer , count the clockwise card not removed, from that position, then remove it and repeat the operation. This continues until only one card left on the table. Is it possible that, initially, there's a card such that, no matter what other card Vasya selects as first card, the one that left is always card ?
Dataset text AI-MO AoPS. Quoted with source.
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