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    Python 3

    def workbook(n, k, arr):
        specials = 0
        page = 0
        for chapter in range(n):
            problems = arr[chapter]
            for page_probs in range(1, problems+1, k):
                page += 1
                if page in range(page_probs, min(page_probs+k, problems+1)):
                    specials += 1
        return specials