To copy a pdf from file system to another pdf on file system

import com.itextpdf.text.pdf.parser.PdfTextExtractor;

import java.io.FileOutputStream;
import com.lowagie.text.Document;
import com.lowagie.text.Rectangle;
import com.lowagie.text.pdf.BaseFont;
import com.lowagie.text.pdf.PdfContentByte;
import com.lowagie.text.pdf.PdfImportedPage;
import com.lowagie.text.pdf.PdfReader;
import com.lowagie.text.pdf.PdfWriter;




public class PDFReaderSample
{
public static void main(String[] args) throws Exception
  {


PdfReader reader = new PdfReader("C:/ABC.pdf");
 int n = reader.getNumberOfPages();
 Rectangle psize = reader.getPageSize(1);
 float width = psize.height();
 float height = psize.width();
Document document = new Document(new Rectangle(width, height));
 PdfWriter Pdfwriter = PdfWriter.getInstance(document,
new FileOutputStream("D:/test/satyam.pdf"));
document.open();

PdfContentByte cb = Pdfwriter.getDirectContent();
int i = 0;
int p = 0;
while (i < n) {
document.newPage();
p++;
i++;
PdfImportedPage page1 = Pdfwriter.getImportedPage(reader, i);
cb.addTemplate(page1, .5f, 0, 0, .5f, 60, 120);
if (i < n) {
i++;
PdfImportedPage page2 = Pdfwriter.getImportedPage(reader, i);
cb.addTemplate(page2, .5f, 0, 0, .5f, width / 2 + 60, 120);
}
BaseFont bf = BaseFont.createFont(BaseFont.HELVETICA,
BaseFont.CP1252,BaseFont.NOT_EMBEDDED);
cb.beginText();
cb.setFontAndSize(bf, 19);
cb.showTextAligned(PdfContentByte.ALIGN_CENTER, "page " + p
+ " of " + ((n / 2) + (n % 2 > 0? 1 : 0)), width / 2, 40, 0);
cb.endText();
}
document.close();

  }
}