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#include <iostream>

int s1[2000001];
int s2[2000001];

using namespace std;

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

    int n, a, w, t;
    cin >> n;
    for (int i=0; i<n; i++) {
        cin >> a >> w >> t;
        if (a==1) {
            s1[w-t+1000000]++;
        }
        else {
            s2[w-t+1000000]++;
        }
    }
    int result = 0;
    for (int i=0; i<2000001; i++) {
        if (s1[i] > 0 && s2[i] > 0) {
            result += min(s1[i], s2[i]);
        }
    }

    cout <<result;
}