DayOfWeek_withArray

using System;
using System.Collections.Generic;

namespace ConsoleApp210
{
    class Program
    {
        static void Main()
        {
            int num = int.Parse(Console.ReadLine());

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

            if(num >= 1 && num <= 7)
            {
                Console.Write(daysOfWeek[num - 1]);
            }
            else
            {
                Console.Write("Invalid day!");
            }
        }
    }
}