using System;

public struct Book
{
    public string name;
    public string field;
    public int year;
}

public class Program
{

    public static void Main()
    {

        Book[] library = new Book[6];

        //....some other code....


        Console.WriteLine("Hello World!");
    }

    public int TotalCount(Book[] books, int n, string field)
    {
        int count = 0;

        for(int i =0; i<n; i++)
            if(books[i].field==field)
                count++;

        return count;
    }

    public Book FindOldest(Book[] books, int n)
    {
        Book oldest = books[0];

        for(int i =1; i<n; i++)
            if(books[i].year<oldest.year)
                oldest = books[i];

        return oldest;
    }
}