using System;

public class Program

{

    public static void Main()

    {

        char op;

        double num1, num2;

        Console.WriteLine("Enter the Operator ( +, -, *, / )");

        op = Console.ReadLine()[0];

        Console.WriteLine("Enter the two numbers one by one");

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

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

        switch( op ) 

        {

            case '+':

                Console.WriteLine("{0} + {1} = {2}",num1,num2,(num1+num2));

                break;

            case '-':

                Console.WriteLine("{0} + {1} = {2}",num1,num2,(num1+num2));

                break;

        }

        Console.WriteLine("Hello World");

    }

}