using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Enter 10 numbers: ");

        int[] A = new int[10];

    int x;

        for(x=0; x < 10; x++)

        {

        A[x] = 0;

            while (!int.TryParse(Console.ReadLine(), out A[x]))

        {

            Console.WriteLine("Enter a number: ");

        }

        }

            Console.WriteLine(LinearSum(A, x));

        LinearSum(A, x);

    }

    private static int LinearSum(int[] A, int x)

    {

      if (x == 1)   // base case

          return A[0];    

      else          // recursive case

          return(A[x-1] + LinearSum(A, x-1)); 

    }

}