# Python!
import re

with open('07.txt') as file:
	rows = file.read().splitlines()

abba = re.compile(r'(\w)(\w)(?<!\1)\2\1')
hynet_seq = re.compile('\[[^\]]*\]')

count = 0
for row in rows:
	valid = False
	stripped = hynet_seq.sub('|', row)
	hynets = hynet_seq.finditer(row)
	
	if abba.search(stripped): valid = True
	
	for h in hynets:
		if abba.search(h.group()): valid = False

	if valid: count += 1

print(count)