06. Sum 3 Numbers V2

using System;

namespace _06.Sums_3_Numbers
{
    class Sums3Numbers
    {
        static void Main(string[] args)
        {
            int numFirst = int.Parse(Console.ReadLine());
            int numSecond = int.Parse(Console.ReadLine());
            int numThird = int.Parse(Console.ReadLine());


           if (numFirst >= 1 && numFirst <= 1000 &&
                numSecond >= 1 && numSecond <= 1000 &&
               numThird >= 1 && numThird <= 1000)
            {
                if (numFirst + numSecond == numThird)
                {
                    if (numFirst > numSecond)
                    {
                        int num = numFirst;
                        numFirst = numSecond;
                        numSecond = num;
                    }

                    Console.WriteLine("{0} + {1} = {2}", numFirst, numSecond, numThird);
                }
                else if (numFirst + numThird == numSecond)
                {
                    if (numFirst > numThird)
                    {
                        int num = numFirst;
                        numFirst = numThird;
                        numThird = num;
                    }
                    Console.WriteLine("{0} + {1} = {2}", numFirst, numThird, numSecond);
                }
                else if (numSecond + numThird == numFirst)
                {
                    if (numSecond > numThird)
                    {
                        int num = numSecond;
                        numSecond = numThird;
                        numThird = num;
                    }
                    Console.WriteLine("{0} + {1} = {2}", numSecond, numThird, numFirst);
                }
                else
                {
                    Console.WriteLine("No");
                }
            }
            else
            {
                Console.WriteLine("invalid numbers");
            }
        }
    }
}