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Authors: AleXman111, sdryapko
author's solution: 100959880
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Author: Vladik
author's solution: 100960218
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Author: Vladik
author's solution: 100960332
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Author: Vladik
author's solution: 100960452
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Authors: AleXman111, sdryapko
author's solution: 100960607
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Author: AleXman111
author's solution: 100960771