using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Please enter the first variable: ");

        int var1 = Convert.ToInt32(Console.ReadLine());

        Console.WriteLine("Please enter the second variable: ");

        int var2 = Convert.ToInt32(Console.ReadLine());

        var1 = var1 + var2;

        var2 = var1 - var2;

        var1 = var1 - var2;

        Console.WriteLine("Now the first variable is: " + var1);

        Console.WriteLine("Now the first variable is: " + var2);

    }

}