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#include<bits/stdc++.h>

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

#define ST first
#define ND second
#define PB push_back
#define SIZE(a) ((int)a.size())

template<class T, class U>
ostream& operator<<(ostream &stream, pair<T, U> &p) {
    stream << "(" << p.ST << "," << p.ND << ")";
    return stream;
}

template<class T>
ostream& operator<<(ostream &stream, vector<T> &v) {
    stream << "[";
    for(auto elem : v) {
        stream << elem << ", ";
    }
    stream << "]";
    return stream;
}

int main() {
    ios_base::sync_with_stdio(0);
    int n;
    cin >> n;
    map<int, pii> m;
    for(int i=0; i < n; i++) {
        int r, w, t;
        cin >> r >> w >> t;
        int id = w-t;
        // cout << id << " " << r << "\n";
        if(!m.count(id)) {
            m[id] = {0, 0};
        }
        if(r == 1) {
            m[id].ST++;
        } else {
            m[id].ND++;
        }
    }   
    int res=0;
    for(auto x : m) {
        res+= min(x.ND.ST, x.ND.ND);
    }
    cout << res << "\n";
}