using System;

using  System.Collections.Generic;

​

namespace ListsDemo

{

    class Program

    {

        static void Main()

        {

            List<int> numbers = new List<int>();

            numbers.Add(1);

            numbers.Add(2);

            numbers.Add(3);

            numbers.Add(10);

            int firstNumber = numbers[3];

            Console.WriteLine(firstNumber);

        }

    }

}