def main():
    q = int(input())
    a = set()
    b = set()
    c = set()
    for _ in range(q):
        u, v, w = map(int, input().split())
        a.add(u)
        a.add(v)
        a.add(w)
        b.add((u, v))
        b.add((u, w))
        b.add((v, w))
        c.add((u, v, w))
    print(len(a)-len(b)+len(c))


if __name__ == "__main__":
    main()