// Code of EsVagy, only corrected by Error42

#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <set>
#include <map>

using namespace std;

struct star
{
	int x, y;
};

int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);

	map<int, set<int>> rows;
	map<int, set<int>> cols;
	vector<star> stars;

	int t;
	cin >> t;
	for (int i = 0; i < t; i++)
	{
		star s;
		cin >> s.x >> s.y;

		stars.push_back(s);

		rows[s.y].insert(s.x);
		cols[s.x].insert(s.y);
	}

	long int ans = 0;

	for (star s : stars)
	{
		ans += (rows[s.y].size() - 1) * (cols[s.x].size() - 1);
	}

	cout << ans << "\n";
}