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#include <iostream>

//#include <chrono> 
//using namespace std::chrono; 

using namespace std;

int main()
{
    long n, tab[2000000][2], r, w, t, ret, i;

//    auto start = high_resolution_clock::now();
    for (i = 0; i < 2000000; i++)
            tab[i][0] = tab[i][1] = 0;

    ret = 0;
    cin >> n;
    for (i = 0; i < n; i++) {
        cin >> r >> w >> t;
        if (r == 1) {
            if (tab[w - t + 1000000][1] > 0) {
                tab[w - t + 1000000][1]--;
                ret++;
            }
            else tab[w - t + 1000000][0] ++;
        }
        else {
            if (tab[w - t + 1000000][0] > 0) {
                tab[w - t + 1000000][0]--;
                ret++;
            }
            else tab[w - t + 1000000][1] ++;
        }
    }

    
//    for (i = 0; i < 200000; i++)
//        ret += (tab[i][0] < tab[i][1] ? tab[i][0] : tab[i][1]);

    cout << ret;

//    auto stop = high_resolution_clock::now(); 
//    auto duration = duration_cast<microseconds>(stop - start);
//    cout << "Timer=" << duration.count() << endl;

    return 0;
}