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

unordered_map < int, int > mapa[2];
set < int > secik;

int main () {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int n;
    cin >> n;
    for (int i=0; i<n; i++) {
        int a, b, c;
        cin >> a >> b >> c;
        mapa[a-1][b-c]++;
        secik.insert(b-c);
    }
    int ans = 0;
    for (auto it: secik) {
        ans += min (mapa[0][it], mapa[1][it]);
    }
    cout << ans;

}