Conditional Statements - Biggest Integer

using System;

    class BiggestInt
    {
        static void Main(string[] args)
        {


            int firstNumber, secondNumber, thirdNumber;

            Console.Write("Enter first number: ");
            firstNumber = int.Parse(Console.ReadLine());
            Console.Write("Enter second number: ");
            secondNumber = int.Parse(Console.ReadLine());
            Console.Write("Enter third number: ");
            thirdNumber = int.Parse(Console.ReadLine());

            if (firstNumber >= secondNumber && firstNumber>= thirdNumber)
            {
                {
                    Console.WriteLine("The biggest number is: {0}", firstNumber);
                }

            }

            else if (secondNumber >= firstNumber && secondNumber >= thirdNumber)
            {
                {
                    Console.WriteLine("The biggest number is: {0}", secondNumber);
                }

            }

            else
            {
                {
                    Console.WriteLine("The biggest number is: {0}", thirdNumber);
                }

            }

        }
    }