Script to add A and B and output them to fukuchan.txt

using System;
using System.IO;

public class Addition
{

  public static void Main(string[] args)
  {

    if (args.Length != 2)
    {
      Console.WriteLine("Incorrect number of arguments");
      Console.WriteLine("usage: Addition.exe <int> <int>");
      return;
    }

    int a = Convert.ToInt32(args[0]);
    int b = Convert.ToInt32(args[1]);

    Console.WriteLine("The sum of {0} and {1} is {2}", a, b, a + b);

    FileStream f = new FileStream("fukuchan.txt", FileMode.Create);
    StreamWriter s = new StreamWriter(f);
    s.Write(a + b);
    s.Close();
  }
}