using System;
using System.Collections.Generic;

namespace test
{
	public class test
	{
		public static void Main()
		{
			List<int> x = new List<int>();
			x.Add(1);
			x.Add(4);
			x.Add(9);
			foreach(int i in x){
				x[2] = 3;
			}
			foreach(int i in x){
				System.Console.WriteLine(i);
			}			
		}
	}
}