using System;

​

public class Program

{

    public String botName, input, name, cOperator;

    public int firstNum, secondNum, results;

    public void Main()

    {

        botName = "NTS and More's Bot";

        Console.WriteLine("Hello");

        input = Console.ReadLine();

        if (input == "Hi" || input == "Hello" || input == "Hey" || input == "hey" || input == "hello" || input == "hi")

        {

            Console.WriteLine("What is your name?");

            name = Console.ReadLine();

            Console.WriteLine("Hello again, " + name + ". You have a nice name. My name is " + botName);

            Console.WriteLine("-----------------------------------------------------------------");

            Console.WriteLine("What should I calculate for you, " + name + "?");

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

            firstNum = int.Parse(Console.ReadLine());

            Console.WriteLine("Enter '+' '-''*' or '/'");

            cOperator = Console.ReadLine();

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

            secondNum = int.Parse(Console.ReadLine());

            if (cOperator == "+")

            {

                results = firstNum + secondNum;

                Console.WriteLine("The answer is" + results);

            }

            else if (cOperator == "-")

            {

                results = firstNum - secondNum;

                Console.WriteLine("The answer is" + results);

            }

            else if (cOperator == "*")

            {

                results = firstNum * secondNum;

                Console.WriteLine("The answer is" + results);

            }

            else if (cOperator == "/")

            {

                results = firstNum / secondNum;

                Console.WriteLine("The answer is" + results);

            }

            else

            {

                Console.WriteLine("Error");

            }

        }

    }

}