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

typedef unsigned long long ull;
typedef long long ll;
typedef long double ld;
typedef pair<int, int> PII;
typedef pair<ll, int> PILL;
typedef pair<ll, ll> PLL;

const int MAX_N = 2e5+5;
const int M = 1e6;
const ll INF = (ll)(1e18);
const int inf = 2e9;
const ll MOD = 1000000007LL;

int n;
map<int, int> x, y;

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

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

    int ans = 0;
    for (auto it: x) {
        int tmpX = it.second;
        int tmpY = y[it.first];
        ans += min(tmpX, tmpY);
    }

    cout << ans << '\n';

    return 0;
}