using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Input firstnumber");

        double firstnumber = double.Parse(Console.ReadLine());

        Console.WriteLine("Input secondnumber");

        double secondnumber = double.Parse(Console.ReadLine());

        char operat =char.Parse(Console.ReadLine());

        Console.WriteLine("Input operator +,-,/,*");

        double result;

        switch (operat)

        {

            case '+' : result = firstnumber + secondnumber;

        Console.WriteLine("{0}+{1}={2}",firstnumber,secondnumber,result);break;

        case '-' : result = firstnumber - secondnumber;

        Console.WriteLine("{0}+{1}={2}",firstnumber,secondnumber,result);break;

            case '/' : result = firstnumber / secondnumber;

        Console.WriteLine("{0}+{1}={2}",firstnumber,secondnumber,result);break;

        case '*' : result = firstnumber * secondnumber;

        Console.WriteLine("{0}+{1}={2}",firstnumber,secondnumber,result);break;

        default:Console.WriteLine("Invalid Operator");break;

        }

    }

}