using System;
using System.Collections.Generic;
using System.Collections;
using System.Windows;

namespace CSharpConsoleApp
{
    class Program
    {
        static void Main()
        {
            List<int> list = new List<int>
            {
                1,
                2,
                56,
                -652
            };

            list[1] = 7;
            //list.RemoveAt(2);
            list.Insert(1, 555);
            int[] xxx = list.();

            foreach (var item in list)
            {
                Console.WriteLine(item);
            }
        }
    }
}