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public class MyCollection
{
    private int[] data;

    public MyCollection(int size)
    {
        data = new int[size];
    }

    // Custom indexer
    public int this[int index]
    {
        get
        {
            if (index >= 0 && index < data.Length)
            {
                return data[index];
            }
            else
            {
                throw new IndexOutOfRangeException();
            }
        }
        set
        {
            if (index >= 0 && index < data.Length)
            {
                data[index] = value;
            }
            else
            {
                throw new IndexOutOfRangeException();
            }
        }
    }
}

class Program
{
    static void Main()
    {
        MyCollection collection = new MyCollection(5);

        // Using the custom indexer to set and get values
        collection[0] = 10;
        collection[1] = 20;
        collection[2] = 30;
        collection[3] = 40;
        collection[4] = 50;

        Console.WriteLine(collection[2]); // Output: 30
    }
}