Have an error overflow in data conversion

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SQL-Server-2008R2

Have an Error concatenating data.


SET @ZYEAR = 2015
SET @ZPERIOD = 5


SET @STARTPERIOD = CONVERT(NVARCHAR,@ZYEAR)+ Right('00' + Convert(varchar(10),@ZPERIOD), 2)


Error

Msg 244, Level 16, State 2, Procedure sp_Construction, Line 176
The conversion of the nvarchar value '201505' overflowed an INT2 column. Use a larger integer column.

How do I correct it.

What I have tried:

i HAVE CHECKED THE INTERNET AND SOME OF MY CODES