using System;

using System.Text;

using System.Numerics;

public class Program

{

    public static void Main()

    {

        int=  a; b; c;

        Console.WriteLine("Enter a first number");

        Console.ReadLine();

        Console.WriteLine(Convert.ToInt32("a"));

        Console.ReadLine();

        Console.WriteLine( "+");

        Console.ReadLine();

        Console.WriteLine("Enter a second  number");

        Console.ReadLine();

        Console.WriteLine(Convert.ToInt32("b"));

        Console.ReadLine();

        Console.WriteLine(( Convert.ToInt32 ("a+b")));

        Console.WriteLine("a+b*2= c");

        Console.ReadLine();

        Console.WriteLine((Convert.ToInt32("c")));  

        Console.ReadLine("resultat=c")

    }

}