#include <bits/stdc++.h>

using namespace std;

#define int long long
#define double long double
#define FOR(i, a, b) for(ll i = (a); i < (b); ++i)
#define FORR(i, a, b) for(ll i = (a); i > (b); --i)
#define REP(i, n) for(ll i = 0; i < (n); ++i)
#define REPR(i, n) for(ll i = n; i >= 0; i--)
#define FOREACH(x, a) for(auto &(x) : (a))
#define VECCIN(x)                                                              \
    for(auto &youso_ : (x)) cin >> youso_
#define bitcnt(x) __builtin_popcount(x)
#define lbit(x) __builtin_ffsll(x)
#define rbit(x) __builtin_clzll(x)
#define SZ(x) ((ll)(x).size())
#define fi first
#define se second
#define All(a) (a).begin(), (a).end()
#define rAll(a) (a).rbegin(), (a).rend()

template <typename T = long long> inline T IN() {
    T x;
    cin >> x;
    return (x);
}
inline void CIN() {}
template <class Head, class... Tail>
inline void CIN(Head &&head, Tail &&... tail) {
    cin >> head;
    CIN(move(tail)...);
}
#define CCIN(...)                                                              \
    char __VA_ARGS__;                                                          \
    CIN(__VA_ARGS__)
#define DCIN(...)                                                              \
    double __VA_ARGS__;                                                        \
    CIN(__VA_ARGS__)
#define LCIN(...)                                                              \
    ll __VA_ARGS__;                                                            \
    CIN(__VA_ARGS__)
#define SCIN(...)                                                              \
    string __VA_ARGS__;                                                        \
    CIN(__VA_ARGS__)
#define Yes(a) cout << (a ? "Yes" : "No") << "\n"
#define YES(a) cout << (a ? "YES" : "NO") << "\n"
#define Printv(v)                                                              \
    {                                                                          \
        FOREACH(x, v) { cout << x << " "; }                                    \
        cout << "\n";                                                          \
    }
template <typename T = string> inline void eputs(T s) {
    cout << s << "\n";
    exit(0);
}
template <typename A, size_t N, typename T>
void Fill(A (&array)[N], const T &val) {
    std::fill((T *)array, (T *)(array + N), val);
}

template <typename T> using PQG = priority_queue<T, vector<T>, greater<T>>;
template <typename T> using PQ = priority_queue<T>;

typedef long long ll;
typedef vector<ll> VL;
typedef vector<VL> VVL;
typedef pair<ll, ll> PL;
typedef vector<PL> VPL;
typedef vector<bool> VB;
typedef vector<double> VD;
typedef vector<string> VS;

const int INF = 1e9;
// const int MOD = 1e9 + 7;
const int MOD = 998244353;
const ll LINF = 1e18;
// const double PI = atan(1.0) * 4.0;
const ll dx[] = {1, 1, 0, -1, -1, -1, 0, 1};
const ll dy[] = {0, 1, 1, 1, 0, -1, -1, -1};
#define PI 3.141592653589793238

// size用
struct UnionFind {
    vector<ll> par;
    vector<ll> sizes;

    UnionFind(ll n) : par(n), sizes(n, 1) { REP(i, n) par[i] = i; }

    ll find(ll x) {
        if(x == par[x]) return x;
        return par[x] = find(par[x]);
    }

    void unite(ll x, ll y) {
        x = find(x);
        y = find(y);

        if(x == y) return;

        if(sizes[x] < sizes[y]) swap(x, y);

        par[y] = x;
        sizes[x] += sizes[y];
        sizes[y] = 0;
    }

    bool same(ll x, ll y) { return find(x) == find(y); }

    ll size(ll x) { return sizes[find(x)]; }
};

signed main() {
    LCIN(N);
    VL x(N), y(N);
    REP(i, N) {
        cin >> x[i] >> y[i];
        x[i]--, y[i]--;
    }
    VL cx(x), cy(y);
    sort(All(cx)), sort(All(cy));
    cx.erase(unique(All(cx)), cx.end()), cy.erase(unique(All(cy)), cy.end());
    REP(i, N) {
        ll idx = lower_bound(All(cx), x[i]) - cx.begin();
        x[i] = idx;
        idx = lower_bound(All(cy), y[i]) - cy.begin();
        y[i] = idx;
    }
    ll sz = cx.size() + cy.size();
    UnionFind uf(sz);
    REP(i, N) uf.unite(x[i], y[i] + cx.size());
    VL xcnt(sz), ycnt(sz);
    REP(i, cx.size()) xcnt[uf.find(i)]++;
    REP(i, cy.size()) ycnt[uf.find(i + cx.size())]++;
    ll cnt = 0;
    REP(i, sz) { cnt += xcnt[i] * ycnt[i]; }
    cout << cnt - N << "\n";
}

Measured memory_bytes: 6528