Jon and Book (very easy)

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Jon Snow decided to read a book. The book contains $n$ chapters, going one after another so that one page of the book belongs to exactly one chapter and each chapter contains at least one page. As Jon Snow was busy dealing with White Walkers, he did not manage to finish reading the book. Jon thought that he would continue reading the book after the Long Night war, so he marked the page with number

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solution.cppC++17

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