using System;

public class Program

{

    public static void Main()

    {

        string firstName;

        int number;

        int secnumber;

        int sum;

        int product;

        int difference;

        Console.WriteLine(" Please tell me your first name ");

        firstName = Console.ReadLine();

        Console.WriteLine(" Please input a number between 0 and 9 ");

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

        Console.WriteLine(" Please input another number between 0 and 9 ");

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

        if( number > 9 ) 

        { number = 5; }

        else if ( number < 0 )

        { number = 5; }

        if( secnumber > 9 ) 

        { secnumber = 5; }

        else if ( secnumber < 0 )

        { secnumber = 5; }

        { sum = number + secnumber; }

        { Console.WriteLine( "The sum of " + number + " + " + secnumber + " = " + sum ); }

        { product = number * secnumber; }

        { Console.WriteLine( "The product of the two numbers is " + product ); }

        { difference = number - secnumber; }

        { Console.WriteLine( "The difference of the two numbers is " + difference  ); }

        Console.WriteLine(firstName + " Thank you for using the calculator!! " );

        Console.ReadLine();

    }

}