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Thanks for the reply frabjous . It works. Can I also use its value for some arithmetic operations such as to learn the difference between the current page number and the first page?
Actually what I want to do is to change the header in every page. However when I do it with \ifodd it might fail ...

I am trying to control headers depending on the pagenumber when the article starts. There are several articles so I want to keep their start page in the memory as a constant. I have tried following commands but I am new in latex so I couldn't find any other way to do it.

I have written them in an ...