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#include <bits/stdc++.h>
using namespace std;
#define inf 1000000007

int n, r, w, t, ile[3][2000007], do_usuniecia;

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

    cin >> n;
    for (int i=1; i<=n; i++)
    {
        cin >> r >> w >> t;
        ile[r][w-t+1000000]++;
    }
    for (int i=0; i<=2000000; i++)
        do_usuniecia += min(ile[1][i], ile[2][i]);

    cout << do_usuniecia << "\n";

    return 0;
}