Вывести элементы массива с нечетными номерами в порядке убывания номеров

unit Unit17;
 
interface
 
uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Vcl.Grids;
 
type
  TForm17 = class(TForm)
    Button1: TButton;
    StringGrid1: TStringGrid;
    Edit1: TEdit;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;
 
var
  Form17: TForm17;
  var
  A:array[1..7] of integer;
  N,i: integer;
 
implementation
 
{$R *.dfm}
 
procedure TForm17.Button1Click(Sender: TObject);
begin
 i:=StrToint (Edit1.text) ;
for i := 1 to N do
read(A[i])                ;
i := i - 2;
while i > 1 do
begin
  i := i - 2;
  StringGrid1.Cells [i,0]:= inttostr (I);
  StringGrid1.Cells [i,1]:= inttostr (a[I]);
 
 
end;
 
 
end;
 
end.

i := n;
while i > 0 do
begin
  StringGrid1.Cells [i,0]:= inttostr (I);
  StringGrid1.Cells [i,1]:= inttostr (a[I]);
  i := i - 2;  
end;