using System;

public class Program

{

    public static void Main()

    {

        int[] numbers = { 4, 5, 6, 1, 2, 3, -2, -1, 0 };

        for (int i = 0; i < numbers.Length; ++i)

        {

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

            Console.WriteLine("Before: numbers[i] = {0}", numbers[i]);

            numbers[i] = numbers[i] - 1;

            Console.WriteLine("After: numbers[i] = {0}\r\n", numbers[i]);

        }

    }

}