Problem:
Day of Week

The 9th day of September 2017 is Saturday. Then, what day of the week is the X-th of September 2017?

Given a day in September 2017, write a program to report what day of the week it is.

Input

The input is given in the following format.

X

The input line specifies a day X (1 ≤ X ≤ 30) in September 2017.

Output

Output what day of the week it is in a line. Use the following conventions in your output: "mon" for Monday, "tue" for Tuesday, "wed" for Wednesday, "thu" for Thursday, "fri" for Friday, "sat" for Saturday, and "sun" for Sunday.

Sample Input 1

1

Sample Output 1

fri

Sample Input 2

9

Sample Output 2

sat

Sample Input 3

30

Sample Output 3

sat

Solution in C# (judge verdict: Accepted)

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

namespace Day_of_Week
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] week = { "thu", "fri", "sat", "sun", "mon", "tue", "wed"};

            int day = 0;

            while (day < 1 || day > 30)
            {
                day = int.Parse(Console.ReadLine());
            }

            int weekday = day % 7;
            Console.WriteLine(week[weekday]);
        }
    }
}