Getting the maximum number of internal mode (internal sessions)

Is there a way to find out the maximum number or internal sessions?

I use the FM:

CALL FUNCTION 'TH_USER_INFO'

IMPORTING

act_sessions = lv_actual_sess

max_sessions = lv_maximal_sess

my_session = lv_my_sess

my_internal_session = lv_my_int_sess

rc = lv_rc.

To get the number of internal sessions in lv_my_int_sess.

I need the maximum number of internal sessions in order to compare it but I cannot find out how to get it.