N = int(input())
V = set()
E = set()
F = set()
for _ in range(N) :
	A = [int(x) for x in input().split()]
	for a in A :
		V.add(a)
	A.append(A[0])
	for i in range(3) :
		E.add((min(A[i], A[i+1]), max(A[i], A[i+1])))
	F.add((A[0], A[1], A[2]))
print(len(V) - len(E) + len(F))