02.09.03.02.SpecialValueRec

using System;

class SpecialValue
{
    static void SeparateNumbers(string[] allArrs)
    {
        string[][] numbArrInArr = new string[allArrs.Length][];
        intArrInArr = new int[allArrs.Length][];
        for (int i = 0; i < allArrs.Length; i++)
        {
            numbArrInArr[i] = allArrs[i].Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
            intArrInArr[i] = new int[numbArrInArr[i].Length];
            for (int j = 0; j < numbArrInArr[i].Length; j++)
            {
                intArrInArr[i][j] = int.Parse(numbArrInArr[i][j].Trim());
            }
        }
    }

    static int[][] intArrInArr;

    static int counter = 1;
    static int sum = 0;

    static int FindNumberOfCells(int currentArr, int currentIndex)
    {
        if ((currentArr >= intArrInArr.Length - 1) && counter == 1)
        {
            currentArr = 0;
        }
        int lastNumber = intArrInArr[currentArr][currentIndex];
        // проверяваме за изход
        counter++;
        sum = counter + Math.Abs(lastNumber);
        if (intArrInArr[currentArr][currentIndex] < 0)
        {
            //intArrInArr[currentArr][currentIndex] = int.MaxValue;
            return sum;
        }
        if (intArrInArr[currentArr][currentIndex] == int.MaxValue)
        {
            counter = 0;
            return sum;
        }
        if (intArrInArr[currentArr][currentIndex] >= 0)
        {
            int tempIndex = currentIndex;
            currentIndex = intArrInArr[currentArr][currentIndex];
            intArrInArr[currentArr][tempIndex] = int.MaxValue;
            if (currentArr >= intArrInArr.Length - 1)
            {
                currentArr = -1;
            }
            FindNumberOfCells(currentArr + 1, currentIndex);
        }
        return sum;
    }


    static void Main()
    {
        string input = Console.ReadLine(); //"2"; //
        int length = int.Parse(input);

        string[] allArrs = new string[length];

        for (int i = 0; i < allArrs.Length; i++)
        {
            allArrs[i] = Console.ReadLine();
        }

        //allArrs[0] = "3, 2, -8, -2, -5, -3, 0, -2";


        SeparateNumbers(allArrs);
        int sum = 0;
        int maxSum = 0;
        for (int j = 0; j < intArrInArr[0].Length; j++)
        {
            counter = 1;
            if (intArrInArr[0][j] < 0)
            {
                sum = counter + Math.Abs(intArrInArr[0][j]);
            }
            else if (intArrInArr[0][j] == int.MaxValue)
            {
                continue;
            }

            else if (intArrInArr[0][j] >= 0)
            {
                sum = FindNumberOfCells( 0 + 1, intArrInArr[0][j]);
            }

            if (maxSum < sum)
            {
                maxSum = sum;
            }
        }
        Console.WriteLine(maxSum);
    }
}