DayOfWeek

using System;

namespace _1DayOfWeek
{
    class Program
    {
        static void Main(string[] args)
        {
            var digitFrom1To7 = int.Parse(Console.ReadLine());

            string[] daysOfTheWeek = { "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday" };

            if (digitFrom1To7 >= 1 && digitFrom1To7 <= 7)
            {
                Console.WriteLine(daysOfTheWeek[digitFrom1To7 - 1]);
            }
            else
            {
                Console.WriteLine("Invalid day!");
            }
        }
    }
}