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

#define endl '\n'
#define L long long
#define MP make_pair
#define REP(i, n) for(int i = 0; i < n; ++i)
#define REPR(i, n) for(int i = n - 1; i >= 0; --i)
#define FOR(i, a, b) for(int i = a; i < b; ++i)
#define FORR(i, a, b) for(int i = b - 1; i >= a; --i)
#define EB emplace_back
#define ST first
#define ND second
#define S size()
#define RS resize

using VI = vector<int>;
using VVI = vector<VI>;
using PI = pair<int, int>;
using VPI = vector<PI>;
using VVPI = vector<VPI>;
using VL = vector<L>;
using VVL = vector<VL>;
using VB = vector<bool>;
using VC = vector<char>;

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    
    int n, k = 1e6 + 1;
    cin >> n;
    VI p1(2 * k), p2(2 * k);
    REP(i, n)
    {
        int r, w, t;
        cin >> r >> w >> t;
        if (r == 1)
            p1[w - t + k]++;
        else
            p2[w - t + k]++;
    }
    
    int wynik = 0;
    REP(i, 2 * k)
        wynik += min(p1[i], p2[i]);
    cout << wynik;
}