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#include <iostream>
#include <vector>
#include <string>

using namespace std;

int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	
	int n;
	cin >> n;
	
	vector<pair<int,int>> K(2000005, make_pair(0,0));
	
	while(n--){
		int r, w, t;
		cin >> r >> w >> t;
		
		if(r == 1){
			K[w-t+1000000].first++;
		} else {
			K[w-t+1000000].second++;
		}
	}
	
	int res = 0;
	for(auto a : K){
		res += min(a.first, a.second);
	}
	
	 cout << res << '\n';
}