import java.util.Scanner;

public class Library {
	private  Book[] arrOfBooks;
	int numOfDiffBooks = 0;
	final int sizeOfLibrary;
	Scanner input = new Scanner(System.in);
	public Library(int size)
	{
		sizeOfLibrary = size;
		arrOfBooks = new Book[size];
	}
	public boolean putBook(Book someBook)
	{
		for (int i = numOfDiffBooks-1; i>=0;i--)
		{
			if (someBook.equals (arrOfBooks[i]))
			{
				arrOfBooks[i].setCopys(arrOfBooks[i].getCopys()+1);
				return true;
			}
		}
			if (numOfDiffBooks + 1 <= sizeOfLibrary )
			{
				numOfDiffBooks++;
				arrOfBooks[numOfDiffBooks-1] = someBook;
				return true;
			}
			return false;
	}
	public int numberOfDifBooks()
	{
		return numOfDiffBooks;
	}
	public int numOfCopies(Book someBook)
	{
		for (Book Books : arrOfBooks)
		{
			if (someBook.equals(Books))
				return Books.getCopys();
		}
		return 0 ;
	}
	public int numOfBooks()
	{
		int sum = 0;
		for (int i = 0; i<numOfDiffBooks;i++)
			sum+= arrOfBooks[i].getCopys();
		return sum;
	}

}







import java.lang.String;
public class Book {
	private String nameOfBook;
	private int copys;

	public Book(String title)
	{
		nameOfBook = title;
		copys = 1;
	}
	public void setName(String name)
	{
		nameOfBook = name;
	}
	public String getTitle()
	{
		return nameOfBook;
	}
	public boolean equals(Book other)
	{
	if (nameOfBook.equals(other.getTitle()))
		return true;
	else return false;
	}
	public int getCopys()
	{
		return copys;
	}
	public void setCopys(int num)
	{
		copys = num;
	}
}



import java.util.Scanner;

public class LibTest {

	public static void main(String[] args) {

		final int size;
		int tmp,tmpCpy;
		Library lib = null;
		Book someBook = null;

		System.out.println("Enter library size: ");
		Scanner input = new Scanner(System.in);
		size = input.nextInt();
		lib = new Library(size);

		//Menu with options (put book,checking library size, and number of copies for a specific book
		do {
			System.out.println("\nWhat would you like to do next?\n\n1 - Put book\n2 - Show the amount of diffrent books the library can hold\n3 - Show number of copies for a specific book\n4 - Total number of books in the library\n5 - Exit");
			tmp = input.nextInt();
			input.nextLine();

			switch(tmp) {

			case 1:
				System.out.println("Enter book name: ");
				someBook = new Book(input.nextLine());
				if (lib.putBook(someBook)) {
					System.out.println("The book '"+someBook.getTitle()+"' was entered!");
					}
				else {
					System.out.println("Library is full!");
					}
				break;

			case 2:
				System.out.println("The library can hold a maximum of " + lib.sizeOfLibrary + " different books");
				break;

			case 3:
				System.out.println("Enter book name: ");
				someBook= new Book(input.nextLine());
				tmpCpy = lib.numOfCopies(someBook);
				if (tmpCpy>0) {
					System.out.println("The library has " + tmpCpy + " copies of the book: " + someBook.getTitle());
					}
				else {
					System.out.println("Book doesn't exist");
					}
				break;
			case 4:
				System.out.println("The total is: " + lib.numOfBooks());
				break;
			case 5:
				System.out.println("Good bye!");
				input.close();
				return;
			default:
				System.out.println("Not valid, try again.");


			}
		}while(tmp != 0);

		input.close();
	}
}