using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Enter a Number: ");

        double num1= Convert.ToDouble(Console.ReadLine());

        Console.WriteLine("Enter an Operator: ");

            string  Op=Console.ReadLine();

        Console.WriteLine("Enter a Number: ");

        double num2= Convert.ToDouble(Console.ReadLine());

        if(Op ==" + ")

        {

            Console.WriteLine((num1 + num2));

        } else if (Op=="-"){

        Console.WriteLine(num1 - num2);

        }

        else if (Op=="*"){

        Console.WriteLine(num1 * num2);

        }

        else if (Op=="/"){

        Console.WriteLine(num1 / num2);

        }

    }

}