Problem:
Score : 100 points

Problem Statement

Given is a string S representing the day of the week today.

S is SUN, MON, TUE, WED, THU, FRI, or SAT, for Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, and Saturday, respectively.

After how many days is the next Sunday (tomorrow or later)?

Constraints

S is SUN, MON, TUE, WED, THU, FRI, or SAT.

Input

Input is given from Standard Input in the following format:

S

Output

Print the number of days before the next Sunday.

Sample Input 1

SAT

Sample Output 1

1

It is Saturday today, and tomorrow will be Sunday.

Sample Input 2

SUN

Sample Output 2

7

It is Sunday today, and seven days later, it will be Sunday again.

Solution in C# (Mono 4.6.2.0) (judge verdict: Runtime Error)

using System;
using System.Linq;
using System.Collections.Generic;
using System.Numerics;
namespace AtCoder
{
    public class Program
    {
        public static void Main(string[] args)
        {
            var input = Console.ReadLine().Split().Select(long.Parse).ToArray();
            var A = input[0];
            var B = input[1];
            var X = input[2];
            if(X < A * 1 + B * 1)
            {
                Console.Write("0");
            }
            else if (A * 1e9 + B * 9 < X)
            {
                Console.Write("1000000000");
            }
            else
            {
                var N = X/A + 1;
                for(long i = N; i>0; i--)
                {
                    if (X >= A * i  + B * Ketanum(i))
                    {
                        Console.Write(i);
                        break;
                    }
                    
                }
                
            }
        }

        public static int Ketanum(long num)
        {
            return (int)Math.Log10(num) + 1;
        }
    }
}