def get_show_size(size)
            if size > @pro * @pro * @pro
                return format("%.2f",(size.to_f/(@pro*@pro*@pro))) + "GB"
             elsif size > @pro * @pro
                return format("%.2f",(size.to_f/(@pro*@pro))) + "MB"
             elsif size > @pro
                return format("%.2f",(size.to_f/@pro)) + "KB"
            else
                return size.to_s + "B"
             end
        end
def get_show_size(size)
            if size > @pro * @pro * @pro
                return format("%.2f",(size.to_f/(@pro*@pro*@pro))) + "GB"
             elsif size > @pro * @pro
                return format("%.2f",(size.to_f/(@pro*@pro))) + "MB"
             elsif size > @pro
                return format("%.2f",(size.to_f/@pro)) + "KB"
            else
                return size.to_s + "B"
             end
        end
get_show_size