Unhandled Exception: System.FormatException: Index (zero based) must be greater than or equal to zero and less than the size of the argument list.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class LargestofThree
    {
       
        static void Main(string[] args)
        {
        
        
        int _firstNumber, _secondNumber, _thirdNumber;


        Console.WriteLine("Enter your 3 numbers to compare");


        _firstNumber = int.Parse(Console.ReadLine());
        _secondNumber = int.Parse(Console.ReadLine());
        _thirdNumber = int.Parse(Console.ReadLine());

        if (_firstNumber>_secondNumber && _firstNumber>_thirdNumber)
        {
            Console.WriteLine("The Greatest of 3 numbers is {0}",_firstNumber);
        }
        else if (_secondNumber>_firstNumber && _secondNumber>_thirdNumber)
        {
            Console.WriteLine("The Greatest of 3 numbers is {1}",_secondNumber);
        }
        else if (_thirdNumber>_firstNumber &&_thirdNumber>_secondNumber)
        {
           Console.WriteLine("The Greatest of 3 numbers is {2}",_thirdNumber);
        }



        }
    }
}