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//Author: Piotr Zielinski
#include <bits/stdc++.h>

using namespace std;

map<int, pair<int, int>> m;

int main() {
    ios::sync_with_stdio(0);
    cin.tie(nullptr);
    int n, a, b, c, res = 0;
    cin >> n;
    while(n --> 0) {
        cin >> a >> b >> c;
        if(a == 1)
            m[b-c].first++;
        else
            m[b-c].second++;
    }
    for(auto I : m) {
        res += min(I.second.first, I.second.second);
    }
    cout << res << "\n";
    return 0;
}