uses Crt, Graph;

var
  GraphDriver, GraphMode : Integer;
  Color                  : Word;
  Palette                : PaletteType;
begin
  GraphDriver := Detect;
  InitGraph(GraphDriver, GraphMode, 'X:\BP');
 if GraphResult <> grOk then
   Halt(1);
  GetPalette(Palette);
 if Palette.Size <> 1 then
 begin
   for Color := 0 to Pred(Palette.Size) do
   begin
      SetColor(Color);
      Line(0, Color * 5, 100, Color * 5);
   end;
   Randomize;
   repeat
      SetPalette(Random(Palette.Size), Random(Palette.Size));
   until KeyPressed;
 end
 else
    Line(0, 0, 100, 0);
 ReadLn;
  CloseGraph;
end.