Little John

using System;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;

class LittleJohn
{
    static void Main()
    {
        string arrowTypePattern = @"\W{1,3}\-{5}\W{1,2}";

        string smallArrowPattern = @">{1}\-{5}\>{1}";
        string mediumArrowPattern = @">{2}\-{5}\>{1}";
        string largeArrowPattern = @">{3}\-{5}\>{2}";

        Regex typeRegex = new Regex(arrowTypePattern);
        Regex smallRegex = new Regex(smallArrowPattern);
        Regex mediumRegex = new Regex(mediumArrowPattern);
        Regex largeRegex = new Regex(largeArrowPattern);

        int largeArrowsCount = 0;
        int mediumArrowsCount = 0;
        int smallArrowsCount = 0;

        for (int i = 0; i < 4; i++)
        {
            string input = Console.ReadLine();

            MatchCollection match = typeRegex.Matches(input);

            if (match.Count > 0)
            {

                foreach (var arrow in match)
                {
                    Match largeArrowMatch = largeRegex.Match(arrow.ToString());

                    if (largeArrowMatch.Success)
                    {
                        largeArrowsCount++;
                    }
                    else
                    {
                        Match mediumArrowMatch = mediumRegex.Match(arrow.ToString());

                        if (mediumArrowMatch.Success)
                        {
                            mediumArrowsCount++;
                        }
                        else
                        {
                            Match smallArrowMatch = smallRegex.Match(arrow.ToString());

                            if (smallArrowMatch.Success)
                            {
                                smallArrowsCount++;
                            }
                        }
                    }
                }
            }
        }

        int theNumbderInDec = 100 * smallArrowsCount + 10 * mediumArrowsCount + largeArrowsCount;

        string theNumberInBinary = Convert.ToString(theNumbderInDec, 2);

        StringBuilder sb = new StringBuilder();

        for (int i = theNumberInBinary.Length - 1; i >= 0; i--)
        {
            sb.Append(theNumberInBinary[i]);
        }

        string combinedNumber = theNumberInBinary + sb.ToString();

        int combinedNumberInDec = Convert.ToInt32(combinedNumber, 2);
        Console.WriteLine(combinedNumberInDec);
    }
}