#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const int INF = 1e9 + 10;
const ll INFL = 4e18;

int main() {
    int Q;
    cin >> Q;

    set<int> V;
    set<pair<int, int>> E;
    set<tuple<int, int, int>> F;

    while (Q--) {
        int a, b, c;
        cin >> a >> b >> c;
        V.insert(a), V.insert(b), V.insert(c);
        E.insert({a, b}), E.insert({b, c}), E.insert({a, c});
        F.insert({a, b, c});
    }

    cout << ssize(V) - ssize(E) + ssize(F) << endl;
}