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#include <iostream>
#include <unordered_map>

using namespace std;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int n;
    cin >> n;
    unordered_map<long, long> mapRow;
    unordered_map<long, long> mapCol;
    while (n--) {
        int type, loc, t;
        cin >> type >> loc >> t;
        if (type == 1) {
            mapRow[t - loc]++;
        } else {
            mapCol[t - loc]++;
        }
    }
    long res = 0;
    for (auto const& entry : mapRow) {
        long hasKey = mapCol.count(entry.first);
        if (hasKey > 0) {
            long colCount = mapCol.at(entry.first);
            res += min(colCount, entry.second);
        }
    }
    cout << res << '\n';
    return 0;
}