SumAboveMainDIagonal

namespace MatrixSum
{
    using System;
    using System.Numerics;

    public class Program
    {
        public static void Main(string[] args)
        {
            var rows = int.Parse(Console.ReadLine());
            var matrix = GetMatrix(rows);
            BigInteger sum = 0;

            for (int row = 0; row < matrix.GetLength(0); row++)
            {
                for (int col = 0; col < matrix.GetLength(1); col++)
                {
                    if (col > row)
                    {
                        sum += matrix[row, col];
                    }
                }
            }
            Console.WriteLine(sum);

        }
        static int[,] GetMatrix(int size)
        {
            var matrix = new int[size, size];

            var currentRow = 1;
            var counter = 1;
            for (int row = 0; row < size; row++)
            {
                for (int col = 0; col < size; col++)
                {
                    matrix[row, col] = counter;
                    counter *= 2;

                    if (col == size - 1)
                    {
                        currentRow *= 2;
                        counter = currentRow;
                    }
                }
            }
            return matrix;
        }
      /*  static void PrintMatrix(int rows, int[,] matrix)
        {
            for (int row = 0; row < rows; row++)
            {
                for (int col = 0; col < rows; col++)
                {
                    Console.Write(matrix[row, col] + " ");
                }
                Console.WriteLine();
            }
        }*/
    }
}