using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Enter the base number: ");

        int baseNumber = Convert.ToInt32(Console.ReadLine());

        Console.WriteLine("Enter the power: ");

        int powerNumber = Convert.ToInt32(Console.ReadLine());

        int sum = 0;

        int[] arr = new int[400];   // Just a wild guess about numbers of digists which our calculation might produce

        arr[0] = baseNumber;

        int carry = 0;

        for (int j = 1; j < powerNumber; j++)

        {

            for (int i = 0; i < arr.Length; i++)

            {

                int tempno = arr[i] * baseNumber;

                if (tempno > 9)

                {

                    arr[i] = (tempno % 10) + carry;                    

                    carry = 1;

                }

                else

                {

                    arr[i] = tempno + carry;                    

                    carry = 0;

                }

            }

        }        

        for (int i = 0; i < arr.Length; i++)        

        {

            sum += arr[i];            

            Console.Write(arr[i]);

        }

        Console.WriteLine();

        Console.WriteLine("Sum of Digits = " + sum);

    }

}

​