Greatest Variable

/*
 * Write a program that finds the greatest of given 5 variables.
*/

using System;

class GreatestVariable
{
    static void Main()
    {
        decimal[] variable = new decimal[5];
        decimal greatestVariable = 0;
        int i;

        string invalidInput = "Please enter a value between " + decimal.MinValue + " and " + decimal.MaxValue + Environment.NewLine;

        for (i = 0; i < 5; i++)
        {
            Console.WriteLine("Enter value of variable" + (i + 1) + ": ");
            while (!(decimal.TryParse(Console.ReadLine(), out variable[i]) && variable[i] >= decimal.MinValue && variable[i] <= decimal.MaxValue))
            {
                Console.WriteLine(invalidInput);
                Console.WriteLine("Enter value of variable" + (i + 1) + ": ");
            }
        }

        for (int j = 0; j < 5; j++)
        {
            for (int k = 0; k < j; k++)
            {
                if (variable[j] > variable[k])
                {
                    greatestVariable = variable[j];
                    variable[k] = variable[j];
                }
                else
                {
                    greatestVariable = variable[k];
                    variable[j] = variable[k];
                }
            }
        }
        Console.WriteLine("The greatest variable is {0}" + Environment.NewLine,greatestVariable);
        Main();
    }
}