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

vector <int> nort;
vector <int> eas;

int main (){
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    int n;
    cin >> n;

    for (int i = 0; i < n; i ++){

        int r, w, t;
        cin >> r >> w >> t;

        if (r == 1) nort.push_back(w - t);
        else eas.push_back(w - t);

    }

    sort (nort.begin(), nort.end());
    sort (eas.begin(), eas.end());

    // for (int no: nort) cout << no << " ";
    // cout << "\n";

    // for (int no: eas) cout << no << " ";
    // cout << "\n";

    int j = 0;

    int ans = 0;

    for (int i = 0; i < (int)nort.size(); i ++){

        while (j < (int)eas.size() && nort[i] > eas[j]) j ++;

        if (j < (int)eas.size() && nort[i] == eas[j]){

            int ile_i = 1;
            int ile_j = 1;

            // cout << "sdhv\n";

            while (i + 1 < (int)nort.size() && nort[i] == nort[i + 1]) {
                i ++;
                ile_i ++;
            }

            while (j + 1< (int)eas.size() && eas[j] == eas[j + 1]){
                j++;
                ile_j++;
            } 

            ans += min(ile_i, ile_j);

            // cout << i << " " << j << "\n";
            
        }

    }

    cout << ans << "\n";

    // for (auto x: nor) cout << x.first << " " << x.second << "\n";
    
}