7th (3*2 +1 = 4)

[hezedu]

http://tympanus.net/codrops/css_reference/nth-child/
http://tympanus.net/codrops/css_reference/nth-last-child/
http://tympanus.net/codrops/css_reference/nth-of-type/
http://tympanus.net/codrops/css_reference/nth-last-of-type/

[SaraSoueidan]

Fixed, thanks!