DayOfWeek

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

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

            Console.WriteLine(numDay > 7 || numDay < 1 ? "error"
                : DateTime.ParseExact($"{numDay}/08/2016", "d/MM/yyyy", CultureInfo.InvariantCulture).DayOfWeek.ToString());
        }
    }
}