find log file name

I am trying to shrink my log file which is huge in SQL.  I am going to use the following to complete the task

USE <db_name>

--find and copy/save the logical name of log file using command below; 
--the first column is the logical file name
EXEC sp_helpfile

ALTER DATABASE <db_name>
    SET RECOVERY SIMPLE

DBCC SHRINKFILE ( 2 )

ALTER DATABASE <db_name>
    MODIFY FILE ( NAME = <logical_file_name_for_log_file>, SIZE = 100MB, FILEGROWTH = 20MB )

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Only problem I'm having is , where do I find the logical file name for log file?