using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var arrOriginal = new int[] { 1, 2, 3, 4, 5 };

        var arrFinal = arrOriginal.Select(n => n * -1);

        foreach(var n in arrFinal)

        {

            Console.WriteLine(n);

        }

    }

}