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#include <bits/stdc++.h>
#define fi first
#define se second
#define pb push_back

using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<long long, long long> pll;

int cnta[2000009], cntb[2000009];
int n, r, w, t;

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

    cin >> n;

    for (int i = 1; i <= n; i++)
    {
        cin >> r >> w >> t;

        if (r == 1)
        {
            cnta[w - t + 1000000]++;
        }
        else
        {
            cntb[w - t + 1000000]++;
        }
    }

    int sum = 0;
    for (int i = 0; i <= 2000000; i++)
    {
        sum += min(cnta[i], cntb[i]);
    }

    cout << sum << "\n";
}