I would guess the answer is some variation of the number 9. Just a guess.
Here is my answer, and then "Let the games begin." In other words "Argue it if you will."
1st Denial: Jn 18:17
2nd Jn 18:25
3rd Mt 26:69,70
4th Mt 26:71,72
5th Mk 14:69-71a
6th Mk 14:70b,71; Jn 18:26,27; Mt 26:73,74
Mt- Before [bless and do not curse][bless and do not curse][bless and do not curse][bless and do not curse] crows, deny 3 Denials 3,4,6
Mk- Before [bless and do not curse][bless and do not curse][bless and do not curse][bless and do not curse] crows twice, deny 3 Denials 3,5,6
Lk- Not crow before, 3 denials Denials 3,4,6
Jn- Not crow before, 3 denials Denials 1,2,6
Mt 26:34 26:69-75 Maid, maid, they, crow
Mk 14:30 14:66-72 Maid, crow, maid, they, crow
Lk 22:34 22:56-62 Woman (3rd denial), man (4th denial), man (6th denial), crow
Jn 13:38 18:15-18,25-27 Maid (1st denial), they (2nd denial), Malchus, crow