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

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    unordered_map<int, int> avenues;
    unordered_map<int, int> streets;
    int n, r, w, t;
    cin >> n;
    for (int i = 0; i < n; ++i)
    {
        cin >> r;
        cin >> w;
        cin >> t;
        if (r == 1)
        {
            ++avenues[w - t];
        }
        else
        {
            ++streets[w - t];
        }
    }

    int call_off = 0;
    for (const auto& pair : avenues)
        call_off += min(pair.second, streets[pair.first]);

    cout << call_off;
    return 0;
}