#include <bits/stdc++.h>
using namespace std;
using LL = long long;

template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }


// std::vector Declaration
template<typename T>
vector<T> make_v(size_t a) { return vector<T>(a); }
template<typename T,typename... Ts>
auto make_v(size_t a,Ts... ts) {
    return vector<decltype(make_v<T>(ts...))>(a,make_v<T>(ts...));
}

// std::vector Initialization
template<typename T>
void fill_all(T& arr, const T& v) { arr = v; }
template<typename T, typename U>
void fill_all(T& arr, const U& v) { for (auto& i : arr) fill_all(i, v); }

// std::vector Debug
template<typename T>
ostream& operator<<(ostream& os, const vector<T>& v) {
    os << "[";
    bool a = 1;
    for (auto e : v ) {
        os << (a ? "" : " "); 
        os << e;
        a = 0;
    }
    os << "]";
    return os;
}

// std::pair Debug
template<typename T, typename U>
ostream& operator<<(ostream& os, const pair<T, U>& p) {
    os << "(" << p.first << " " << p.second << ")";
    return os;
}

// std::set Debug
template<typename T>
ostream& operator<<(ostream& os, const set<T>& st) {
    os << "{";
    bool a = 1;
    for (auto e : st) {
        os << (a ? "" : " ");
        os << e;
        a = 0;
    }
    os << "}";
    return os;
}

// std::multiset Debug
template<typename T>
ostream& operator<<(ostream& os, const multiset<T>& st) {
    os << "{";
    bool a = 1;
    for (auto e : st) {
        os << (a ? "" : " ");
        os << e;
        a = 0;
    }
    os << "}";
    return os;
}

// std::map Debug
template<typename T, typename U>
ostream& operator<<(ostream& os, const map<T, U>& mp) {
    os << "{";
    bool a = 1;
    for (auto e : mp) {
        os << (a ? "" : " ");
        os << e.first << ":" << e.second;
        a = 0;
    }
    os << "}";
    return os;
}

// std::tuple Debug
template<int N, class Tuple>
void out(ostream& os, const Tuple& t){}
template<int N, class Tuple, class H, class ...Ts>
void out(ostream& os, const Tuple& t) {
    if (N) os << " ";
    os << get<N>(t);
    out<N+1,Tuple,Ts...>(os, t);
}
template<class ...Ts>
ostream& operator<<(ostream& os, const tuple<Ts...>& t) {
    os << "(";
    out<0,tuple<Ts...>,Ts...>(os, t);
    os << ")";
    return os;
}

// Debug
#define DUMP(x) cerr<<#x<<" = "<<(x)<<endl


struct edge { int to, cost; };
ostream& operator<<(ostream& os, const edge& e) {
    os << "(" << e.to << ", " << e.cost << ")";
    return os;
}

const LL LINF = 1LL<<60;
const int IINF = 1<<30;
const LL MOD = 1e9+7;


void dfs(const auto& G, auto& visited, int v, LL& xcnt, LL& ycnt) {
    if (visited[v]) return;
    visited[v] = true;
    if (v < G.size()/2) ++xcnt;
    else                ++ycnt;
    for (auto u : G[v]) {
        dfs(G, visited, u, xcnt, ycnt);
    }
}

int main()
{
    int N; cin >> N;
    vector<int> x(N), y(N);
    for (int i = 0; i < N; ++i) {
        cin >> x[i] >> y[i];
    }

    map<int,int> xmp, ymp;
    for (auto X : x) {
        xmp[X] = -1;
    }
    for (auto Y : y) {
        ymp[Y] = -1;
    }

    LL xsum = 0, ysum = 0;
    for (auto &p : xmp) {
        p.second = xsum++;
    }
    for (auto &p : ymp) {
        p.second = ysum++;
    }

    // DUMP(xmp);
    // DUMP(ymp);

    vector<vector<int>> G(2*N);

    for (int i = 0; i < N; ++i) {
        int xid = xmp[x[i]], yid = ymp[y[i]];
        G[xid].push_back(yid+N);
        G[yid+N].push_back(xid);
    }

    vector<bool> visited(2*N, false);

    LL ans = 0;

    for (int i = 0; i < N; ++i) {
        int xid = xmp[x[i]];
        if (visited[xid]) continue;
        LL xcnt = 0, ycnt = 0, ecnt = 0;
        dfs(G, visited, xid, xcnt, ycnt);

        ans += xcnt*ycnt;
        // DUMP(xcnt);
        // DUMP(ycnt);
        // DUMP(ecnt);
    }

    for (int i = 0; i < N; ++i) {
        int yid = ymp[y[i]];
        if (visited[yid+N]) continue;
        LL xcnt = 0, ycnt = 0, ecnt = 0;
        dfs(G, visited, yid+N, xcnt, ycnt);

        ans += xcnt*ycnt;
        // DUMP(xcnt);
        // DUMP(ycnt);
        // DUMP(ecnt);
    }

    ans -= N;

    cout << ans << endl;

    return 0;
}


Measured memory_bytes: 19712