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#include <bits/stdc++.h>

using namespace std;

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    int n;
    cin >> n;
    map<int, int> diffs[2];

    while (n--) {
        int r, w, t;
        cin >> r >> w >> t;
        diffs[r - 1][w - t]++;
    }

    int res = 0;
    for (auto [key, value] : diffs[0]) {
        res += min(value, diffs[1][key]);
    }

    cout << res << "\n";
}