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#include <bits/stdc++.h>

#define ll long long
#define str string
#define pii pair<int, int>
#define pll pair<ll, ll>
#define fi first
#define se second

#define vc vector<char>
#define vvc vector<vc>
#define vi vector<int>
#define vll vector<ll>
#define vvi vector<vi>
#define vvll vector<vll>
#define vvvll vector<vvll>
#define vs vector<str>
#define vvs vector<vs>
#define vpii vector<pii>
#define vvpii vector<vpii>
#define vpll vector<pll>
#define vvpll vector<vpll>
#define vb vector<bool>
#define vvb vector<vb>
#define rep(i, a, b) for (int i = (a); i < int(b); i++)
#define repi(i, a, b) for (int i = (a); i <= int(b); i++)


using namespace std;
ll INF = LONG_LONG_MAX;
ll mod = 1000000000 + 7;

template <typename T, typename L>
void read(vector<T> & _data, L & _size, bool _shift) {
    _data.resize(_size + (ll)_shift);
    for (ll i = (ll)_shift; i < _size + (ll)_shift; i++)
        cin >> _data[i];
}

template <typename T, typename L>
void read(vector<vector<T>> & _data, L & _rows, L & _cols, bool _shiftRows, bool _shiftCols) {
    _data.resize(_rows + (ll)_shiftRows);
    for (ll i = 0; i < _rows + (ll)_shiftRows; i++)
        _data[i].resize(_cols + (ll)_shiftCols);
    for (ll i = (ll)_shiftRows; i < _rows + (ll)_shiftRows; i++)
        for (ll j = (ll)_shiftCols; j < _cols + (ll)_shiftCols; j++)
            cin >> _data[i][j];
}

template <typename T>
void write(vector<T> & _data, bool _shift) {
    for (ll i = (ll)_shift; i < _data.size(); i++)
        cout << _data[i] << " ";
    cout << endl;
}


//TODO: SOLUTION


void solve() {
    ll n; cin >> n;
    map<ll, ll> N;
    map<ll, ll> W;

    for (int i = 0; i < n; i++) {
        ll r, w, t; cin >> r >> w >> t;
        if (r == 1)
            N[w - t]++;
        else
            W[w - t]++;
    }

    ll ans = 0;
    for (auto p : N) {
        ans += min(p.second, W[p.first]);
    }

    cout << ans << endl;
}


int main() {
    ios::sync_with_stdio(false);
    // TODO: Set value of this variable manually
    bool _multipleTestCases = false;

    if (_multipleTestCases) {
        ll t; cin >> t;
        while (t--)
            solve();
    }
    else {
        solve();
    }

    return 0;
}