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#include <bits/stdc++.h>
using namespace std;


using LL = long long int;
using uLL = unsigned long long int;
using uint = unsigned int;
using ld = long double;

const int N = 1000007;

int tab[2*N][2];

int main(){
	cin.tie(NULL);
	ios_base::sync_with_stdio(0);
	int n;
	cin >> n;
	int maks = 0;
	for(int i = 0; i < n; i++){
		int r, w, t;
		cin >> r >> w >> t;
		maks = max(maks, w-t+N);
		tab[w-t+N][r-1]++;
	}
	int ans = 0;
	for(int i = 0; i <= maks; i++){
		ans += min(tab[i][0], tab[i][1]);
	}
	cout << ans << '\n';
	
	return 0;
}