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

unordered_map<int, pair<int, int>> m;

int n;
int a, b, c;
int w = 0;

int main()
{
    #if IOSTREAM_BOOST
    ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
    #endif
    
    cin >> n;
    for(int i = 0; i < n; i++){
        cin >> a >> b >> c;
        if(a == 1) m[b - c].first++;
        else m[b - c].second++;
    }
    for(auto p : m) w += min(p.second.first, p.second.second);
    cout << w << "\n";
    
    return 0;
}