n is a multiple of 4.
If the number of pages in your PDF document is not a multiple of 4, you should add the appropriate number of blank pages (1,2 or 3) to make it a multiple of 4. To do so, you can:
Create a blank PDF using LibreOffice Writer.
Merge the blank pages with your PDF document using PDF-Shuffler placing the blank pages at the end.
Press the menu button in the top-right corner of the window and press the Print button.
Choose the General tab.
Under Range, choose Pages.
Choose the Page Setup tab.
Under Layout, in the Two-sided menu, select Short Edge (Flip).
In the Pages per side option, select 2.
In the Page ordering menu, select Left to right.
Click Print.
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