using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Introduce numero");

        float n1 = float.Parse(Console.ReadLine());

        Console.WriteLine("Introduce operador");

        string op = Console.ReadLine();

        Console.WriteLine("Introduce numero");

        float n2 = float.Parse(Console.ReadLine());

        if (op == "+")

        {   

            Console.WriteLine( " La suma " + n1+ "y" + n2 + "es " +( n1 + n2) );

        }

        {

            Console.WriteLine(

        }

    }

}