abstract class Citation {

    private Pearson[] author;
    private String title;
    private int year;

    public Citation(Pearson[] author, String title, int year) {
        this.author = author;
        this.title = title;
        this.year = year;
    }

    public Pearson[] getAuthor() {
        return author;
    }

    public String getTitle() {
        return title;
    }

    public int getYear() {
        return year;
    }

    public abstract int getPagesCount();
}


class Book extends Citation {

    private String publisher;

    private String address;

    private int pagesCount;

    public Book(Pearson[] author, String title, int year, String publisher, String address, int pagesCount) {
        super(author, title, year);
        this.publisher = publisher;
        this.address = address;
        this.pagesCount = pagesCount;
    }

    @Override
    public int getPagesCount() {
        return pagesCount;
    }
}


class InCollection extends Book {

    private String bookTitle;

    private Pearson[] editors;

    private int startPage;

    private int endPage;

    public InCollection(Pearson[] author, String title, int year, String publisher, String address, String bookTitle, Pearson[] editors, int startPage, int endPage) {
        super(author, title, year, publisher, address, endPage-startPage);
        this.bookTitle = bookTitle;
        this.editors = editors;
        this.startPage = startPage;
        this.endPage = endPage;

    }

    public String getBookTitle() {
        return bookTitle;
    }

    public Pearson[] getEditors() {
        return editors;
    }

    public int getStartPage() {
        return startPage;
    }

    public int getEndPage() {
        return endPage;
    }
}