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

int main() {
    ios::sync_with_stdio(0);
    
    int cars;
    cin >> cars;

    vector <int> diag1 (2000001);
    vector <int> diag2 (2000001);

    int r, w, t;
    while (cars--) {
        cin >> r >> w >> t;
        if (r == 1)
            diag1[w - t + 1000000]++;
        else 
            diag2[w - t + 1000000]++;
    }

    int licz = 0;
    for (int i = 0; i <= diag1.size(); i++)
        if (diag1[i] && diag2[i])
            licz += min(diag1[i], diag2[i]);

    cout << licz;
}