In a Module, paste following UDF:

Public Function lastSheetName() As String
Application.Volatile
lastSheetName = Worksheets(Worksheets.Count).Name
End Function

Then you can use formula:
=INDIRECT(lastsheetname()&"!A1")+INDIRECT(lastshee tname()&"!B1")

HTH
--
AP

"L.K." a écrit dans le message de
...
Hi all,

I have workbook with the spreadsheets "Input", "Year 1", "Year 2", "Year
3",
....
Workbook has different number of spreadsheets. Last spreadsheet name is
"Year 5" or "Year 6" or "Year 7" ... and it depends how many spreadsheets
are in workbook.

On the first sheet "Input" I have formula which refers to the last
spreadsheets cells (sometimes it is "Year 7" and sometimes "Year 9" ...
and
so on).
Let this formula is:
='Year 7'!A1+'Year 7'!B1

How I can write universal formula (or macro) there instead concrete
spreadsheets names will be reference to the last spreadsheet name
(sometimes
it is "Year 6", sometimes "Year 9" and so on) of workbook.

Thank you in advance.
Best wishes,
Lado