#include <bits/stdc++.h> using namespace std; using ll=long long; int main() { ios::sync_with_stdio(0); cin.tie(0); int n; cin>>n; vector<ll> x_coor(n); vector<ll> y_coor(n); vector<pair<ll, ll>> coor(n); ll x; ll y; for(int i=0; i<n; i++) { cin>>x>>y; x_coor[i]=x; y_coor[i]=y; coor[i]=make_pair(x, y); } sort(x_coor.begin(), x_coor.end()); sort(y_coor.begin(), y_coor.end()); ll ans{}; ll t_x; ll t_y; for(auto i: coor) { t_x=upper_bound(x_coor.begin(), x_coor.end(), i.first)-lower_bound(x_coor.begin(), x_coor.end(), i.first); t_y=upper_bound(y_coor.begin(), y_coor.end(), i.second)-lower_bound(y_coor.begin(), y_coor.end(), i.second); ans+=(t_x-1)*(t_y-1); } cout<<ans; }