# Enter your code here. Read input from STDIN. Print output to STDOUT
no_lines = input()
xml = ' '
for line in range(0, no_lines):
xml = xml + raw_input()
import xml.etree.ElementTree as etree
tree = etree.ElementTree(etree.fromstring(xml))
root = tree.getroot()
def depth(root):
return max([0] + [depth(child) + 1 for child in root])
print depth(root)
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