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

int main()
{
	std::ios_base::sync_with_stdio(false); std::cin.tie(0); std::cout.tie(0);
	int n;
	std::cin >> n;
	std::vector<std::vector<int>> count(2, std::vector<int>(2000000));
	for (int i = 0; i < n; ++i)
	{
		int r;
		int w, t;
		std::cin >> r >> w >> t;
		++count[r - 1][t - w + 1000000];
	}
	int result = 0;
	for (int i = 0; i < 2000000; ++i)
	{
		result += std::min(count[0][i], count[1][i]);
	}
	std::cout << result << std::endl;
	return 0;
}