first rows hint

We are on 10204 and Solaris 10.

I've seen this hint on number of our SQL queries but I'm not sure if this is correct hint.

SELECT /*+ FIRST_ROWS(5000) */ OID, NAME, USER_ID, SERVICE_ID, GROUP_ID, SUBSCRI

I've read about FIRST_ROWS_1 , FIRST_ROWS_10, FIRST_ROWS_100 ,AND FIRST_ROWS_1000 but I've not heard of     FIRST_ROWS(5000). Is that a valid hint, if not then what could be the right hint?

THanks

Mukul