using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Text;
public class MainClass
{
public static void Main()
{
List<int> intList = new List<int>(new int[] { 3, 5, 15, 1003, 25 });
ReadOnlyCollection<int> roList = intList.AsReadOnly();
}
}