using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    //[5, 2, [7, -1], 3, [6, [-13, 8], 4]]

    public static int productSum = 0;

    public static int count = 1;

    public static List<int> numList = new List<int>();

    public static void Main()

    {

        List<object> list = new List<object>();

    List<object> list2 = new List<object>();

    List<object> list3 = new List<object>();

    List<object> list4 = new List<object>();

        list2.Add(7);

        list2.Add(-1);

        list3.Add(-13);

        list3.Add(8);

        list4.Add(6);

        list4.Add(list3);

        list4.Add(4);

        list.Add(5);

        list.Add(2);

        list.Add(list2);

        list.Add(3);

        list.Add(list4);

        Console.WriteLine("    ProdSum : "+ProductSum(list));

        foreach(var num in numList)

            Console.WriteLine(num);

    }

    //[5, 2, [7, -1], 3, [6, [-13, 8], 4]]

    public static int ProductSum(List<object> array)

    {

        productSum = 0;

        foreach(var b in array)

        {

            if(b.GetType() == array.GetType())

            {

                Console.WriteLine("  TYPE : " +b.GetType().ToString().Substring(27,4));

                count+=1;

                Program.ProductSum((List<object>)b);

                Console.WriteLine(count+ " x "+ productSum);

                numList.Add(count* productSum);

                count-=1;

            }

            else

            {

                Console.Write("Count * "+count + " Value :" + Convert.ToInt32(b));

                productSum = (productSum + Convert.ToInt32(b));

                Console.WriteLine("    SUM "+ productSum);

​

                numList.Add(count * productSum);

            }

        }

        return numList.AsQueryable().Sum();

    }

}