at first record of innerloop , want to know how many records exists

How can I know the number of records in INTBSEG for each record of int_maintable before running the loop for that where condition of INTBSEG.

Please see below:

LOOP AT int_maintable.

Loop at INTBSEG where bukrs = int_maintable-bukrs

AND belnr = int_maintable-belnr

AND gjahr = int_maintable-gjahr.

( I want to know at the point of sy-tabix of INTBSEG = 1

how many records exits in INTBSEG ...

for this where bukrs = int_maintable-bukrs

AND belnr = int_maintable-belnr

AND gjahr = int_maintable-gjahr.)

I want to know how many records exits in INTBSEG , for the first record itself of INTBSEG)

Endloop.

ENDLOOP.