using System;

class IndexerClass 
{
   public int this [int index]   // Indexer declaration
   {
      get 
      {
         Console.WriteLine("GET {0}", index);
         return 0;
      }
      set 
      {
         Console.WriteLine("SET {0} {1}", index, value);
      }
   }
}

public class MainClass 
{
   public static void Main() 
   {
      IndexerClass b = new IndexerClass();

      b[5] += 1;
      int x = b[5];

      Console.WriteLine("x={0}", x);
   }
}