n:=strtoint(inputbox('','Zadajte cislo: ','1'));
randomize;
for i:=1 to n do
    begin
        Image1.Canvas.Pen.Color:=random(16000000);
        Image1.Canvas.MoveTo(0,0);
        Image1.Canvas.LineTo(random(Image1.Width),random(Image1.Height));
    end;