CF1463F Max Correct Set

Let's call the set of positive integers $ S $ correct if the following two conditions are met: - $ S \subseteq \{1, 2, \dots, n\} $ ; - if $ a \in S $ and $ b \in S $ , then $ |a-b| \neq x $ and $ |a-b| \neq y $ . For the given values $ n $ , $ x $ , and $ y $ , you have to find the maximum size of the correct set.

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