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

#define pb push_back
#define eb emplace_back
#define mp make_pair
#define lb lower_bound
#define ub upper_bound
#define f first
#define s second

#define sz(x) (x).size()
#define all(x) (x).begin(), (x).end()

using ll = long long;
using pi = pair<int, int>;
using pll = pair<ll, ll>;

using vi = vector<int>;
using vll = vector<ll>;
using vs = vector<string>;
using vpi = vector<pi>;
using vpll = vector<pll>;
map<int, int> m1;
map<int, int> m2;
int n, a, b, c;
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie();
    cin >> n;
    for (int i = 1; i <= n; i++)
    {
        cin >> a >> b >> c;
        a--;
        if (a)
            m2[b - c]++;
        else
            m1[b - c]++;
    }
    int wyn = 0;
    for (auto i : m1)
    {
        // cout << i.f << endl;
        if (m2.count(i.f) > 0);
            wyn += min(m2[i.f], m1[i.f]);
    }
    cout << wyn;
}