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#include <iostream>
#include <vector>
#include <algorithm>
#include <functional>

using namespace std;

int main() {
	ios_base::sync_with_stdio(0);

	int N;

	cin >> N;

	vector<int> diffs1(2000000, 0);
	vector<int> diffs2(2000000, 0);
	reference_wrapper<vector<int>> diffs[] = {ref(diffs1), ref(diffs2)};

	for (int i = 0; i < N; i++) {
		int r, w, t;
		cin >> r >> w >> t;

		diffs[r-1].get()[1000000+t-w]++;
	}

	int s = 0;
	for (int i = 0; i < 2000000; i++) {
		s += min(diffs[0].get()[i], diffs[1].get()[i]);
	}

	cout << s << endl;

	return 0;
}