using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var nums1 = new double[]{0.89,           -0.89};

        Console.WriteLine(nums1.Sum());

        var nums2 = new double[]{0.89,0.89,      -0.89,-0.89};

        Console.WriteLine(nums2.Sum());

        var nums3 = new double[]{0.89,0.89,0.89, -0.89,-0.89,-0.89};

        Console.WriteLine(nums3.Sum());

    }

}