#include <bits/stdc++.h>
#define F first
#define S second
#define pii pair<int, int>
#define pb push_back
using namespace std;
typedef long long ll;
typedef long double ld;
const int N = 3e5 + 10;
int x[N], y[N], dx[N], dy[N];
map<int, int> mx, my;
int main(){
ios_base::sync_with_stdio(0); cin.tie(0);
int n; cin >> n;
for(int i=0; i<n; i++){
cin >> x[i] >> y[i];
mx[x[i]] = my[y[i]] = 0;
}
int cnt = 0;
for(auto X : mx)
mx[X.F] = cnt++;
cnt = 0;
for(auto Y : my)
my[Y.F] = cnt++;
for(int i=0; i<n; i++){
x[i] = mx[x[i]];
y[i] = my[y[i]];
dx[x[i]]++;
dy[y[i]]++;
}
ll ans = 0;
for(int i=0; i<n; i++)
ans += 1LL * (dx[x[i]] - 1) * (dy[y[i]] - 1);
cout << ans << endl;
}
