Q = int(input())
V, E, F = set(), set(), set()

for _ in range(Q):
   a, b, c = map(int, input().split())
   V |= {a, b, c}
   E |= {frozenset({a, b}), frozenset({b, c}), frozenset({c, a})}
   F |= {frozenset({a, b, c})}

print(len(V) - len(E) + len(F))