SoftUniNumerals

namespace _03.SoftUniNumerals
{
    using System;
    using System.Collections.Generic;
    using System.Text;
    using System.Numerics;

    public class SoftUniNumerals
    {
        public static void Main(string[] args)
        {
            string input = Console.ReadLine();

            string zero = "aa";
            string one = "aba";
            string two = "bcc";
            string three = "cc";
            string four = "cdc";

            int totalDigits = 0;
            List<int> digits = new List<int>();

            while (input.Length > 0)
            {
                if (input.StartsWith(zero))
                {
                    input = input.Substring(zero.Length, input.Length - zero.Length);
                    digits.Add(0);
                    totalDigits++;
                }
                else if (input.StartsWith(one))
                {
                    input = input.Substring(one.Length, input.Length - one.Length);
                    digits.Add(1);
                    totalDigits++;
                }
                else if (input.StartsWith(two))
                {
                    input = input.Substring(two.Length, input.Length - two.Length);
                    digits.Add(2);
                    totalDigits++;
                }
                else if (input.StartsWith(three))
                {
                    input = input.Substring(three.Length, input.Length - three.Length);
                    digits.Add(3);
                    totalDigits++;
                }
                else if (input.StartsWith(four))
                {
                    input = input.Substring(four.Length, input.Length - four.Length);
                    digits.Add(4);
                    totalDigits++;
                }
            }

            BigInteger number = 0;
            StringBuilder numberAsString = new StringBuilder();
            for (int i = 0; i < digits.Count; i++)
            {
                numberAsString.Append(digits[i]);
            }

            BigInteger numberInDec = 0;
            int digitPos = digits.Count - 1;
            for (int n = 0; n < totalDigits; n++)
            {
                numberInDec += (BigInteger)digits[n] * Power(5,digitPos);
                digitPos--;
            }

            Console.WriteLine(numberInDec);
        }

        private static BigInteger Power(int fund, int pos)
        {
            BigInteger result = 1;
            for (int i = 0; i < pos; i++)
            {
                result *= fund;
            }

            return result;
        }
    }
}