using System;

​

class Program

{

    static void Main()

    {

        Console.Write("Enter a number 1-7: ");

        if (int.TryParse(Console.ReadLine(), out int dayNumber))

        {

            string dayOfWeek;

​

            switch (dayNumber)

            {

                case 1:

                    dayOfWeek = "Monday";

                    break;

                case 2:

                    dayOfWeek = "Tuesday";

                    break;

                case 3:

                    dayOfWeek = "Wednesday";

                    break;

                case 4:

                    dayOfWeek = "Thursday";

                    break;

                case 5:

                    dayOfWeek = "Friday";

                    break;

                case 6:

                    dayOfWeek = "Saturday";

                    break;

                case 7:

                    dayOfWeek = "Sunday";

                    break;

                default:

                    dayOfWeek = "Invalid input. Please enter a number from 1 to 7.";

                    break;

            }

​

            Console.WriteLine($"Day of the week: {dayOfWeek}");

        }

        else

        {

            Console.WriteLine("Invalid input. Please enter a valid number.");

        }

    }

}