#!/usr/bin/env python3
n = int(input())
P = [input().split('/') for i in range(n)]
i = 1
res = sum(len(p)-1 for p in P)
while True:
	M = {}
	ba = ""
	bc = 0
	for p in P:
		if i < len(p) - 1:
			if p[i] in M:
				M[p[i]] += 1
			else:
				M[p[i]] = 1
			if M[p[i]] > bc:
				bc = M[p[i]]
				ba = p[i]
	if 2*bc > n:
		res += n - 2*bc
	else:
		break
	P = [p for p in P if i < len(p) - 1 and p[i] == ba]
	i += 1
print(res)