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\u0443\u043f\u043e\u0440\u044f\u0434\u043e\u0447\u0435\u043d\u043d\u044b\u0445 \u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u0441\u0442\u0432 \u043f\u043e\u043b\u0443\u0447\u0435\u043d\u044b \u043e\u0446\u0435\u043d\u043a\u0438 \u043c\u043e\u0449\u043d\u043e\u0441\u0442\u0438 \u043c\u043d\u043e\u0436\u0435\u0441\u0442\u0432\u0430 \u0442\u043e\u0447\u0435\u043a \u0441\u043e\u0432\u043f\u0430\u0434\u0435\u043d\u0438\u044f. \u0414\u043b\u044f \u043e\u0442\u043e\u0431\u0440\u0430\u0436\u0435\u043d\u0438\u0439, \u0434\u0435\u0439\u0441\u0442\u0432\u0443\u044e\u0449\u0438\u0445 \u0438\u0437 \u043d\u043e\u0440\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u0441\u0442\u0432 \u0432 \u043c\u0435\u0442\u0440\u0438\u0447\u0435\u0441\u043a\u0438\u0435, \u043f\u043e\u043b\u0443\u0447\u0435\u043d\u044b \u043d\u0435\u043e\u0431\u0445\u043e\u0434\u0438\u043c\u044b\u0435 \u0438 \u0434\u043e\u0441\u0442\u0430\u0442\u043e\u0447\u043d\u044b\u0435 \u0443\u0441\u043b\u043e\u0432\u0438\u044f \u0441\u0443\u0449\u0435\u0441\u0442\u0432\u043e\u0432\u0430\u043d\u0438\u044f \u0431\u043e\u043b\u0435\u0435 \u0447\u0435\u043c \u043e\u0434\u043d\u043e\u0439 \u0442\u043e\u0447\u043a\u0438 \u0441\u043e\u0432\u043f\u0430\u0434\u0435\u043d\u0438\u044f, \u0434\u043e\u0441\u0442\u0430\u0442\u043e\u0447\u043d\u044b\u0435 \u0443\u0441\u043b\u043e\u0432\u0438\u044f \u0441\u0443\u0449\u0435\u0441\u0442\u0432\u043e\u0432\u0430\u043d\u0438\u044f \u043d\u0435 \u043c\u0435\u043d\u0435\u0435 $n$ \u0442\u043e\u0447\u0435\u043a \u0441\u043e\u0432\u043f\u0430\u0434\u0435\u043d\u0438\u044f, \u0434\u043e\u0441\u0442\u0430\u0442\u043e\u0447\u043d\u044b\u0435 \u0443\u0441\u043b\u043e\u0432\u0438\u044f \u0431\u0435\u0441\u043a\u043e\u043d\u0435\u0447\u043d\u043e\u0441\u0442\u0438 \u043c\u043d\u043e\u0436\u0435\u0441\u0442\u0432\u0430 \u0442\u043e\u0447\u0435\u043a 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