Condensed array

using System;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using System.Numerics;

namespace SoftuniExercisesWithVariables
{
    class Program
    {


        static void Main(string[] args)
        {
            Console.WriteLine("Enter the numbers in your array:  ");
            int[] array1 = Console.ReadLine().Split(" ").Select(int.Parse).ToArray();
            int length = array1.Length;
            int[] condensed = new int[length-1];
            while(length > 1)
            {
                condensed = new int[length-1];
                for(int i = 0; i < condensed.Length; i++)
                {
                    condensed[i] = array1[i] + array1[i + 1];
                }
                for(int m = 0; m < condensed.Length; m++)
                {
                    array1[m] = condensed[m];
                }
                length--;
            }
            Console.WriteLine(condensed[0]);
        }
    }
}