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

int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);
    map<int, array<int, 2>> M;
    int n;
    cin >> n;
    while (n--) {
        int r, w, t;
        cin >> r >> w >> t;
        M[w-t][r-1]++;
    }
    int res=0;
    for (auto [a, b]:M) res+=min(b[0], b[1]);
    cout << res << endl;
    return 0;
}