V = set()
E = set()
F = set()
for _ in range(int(input())):
    A, B, C = map(int, input().split())
    V.add(A)
    V.add(B)
    V.add(C)
    E.add(frozenset([A, B]))
    E.add(frozenset([B, C]))
    E.add(frozenset([C, A]))
    F.add(frozenset([A, B, C]))
print(len(V) - len(E) + len(F))