#include <bits/stdc++.h>

using namespace std;

int main() {
    int n;
    vector<pair<int, int>> i_p;
    vector<vector<pair<int, int>>> mat;
    
    i_p.push_back(make_pair(2, 8));
    i_p.push_back(make_pair(3, 9));
    i_p.push_back(make_pair(7, 9));
    
    cin >> n;
    
    for (int i = 0; i < n; i++) {
        vector<pair<int, int>> v;
        mat.push_back(v);
        for (int j = 0; j < 2; j++) {
            int x, y;
            cin >> x >> y;
            mat[i].push_back(make_pair(x, y));
        }
    }
    
    pair<int, int> tmp;
    vector<pair<int, int>> ans;
    for (auto p : i_p) {
        tmp = p;
        for (int i = 0; i < n; i++) {
            if (mat[i][0].first == tmp.first &&
                mat[i][0].second == tmp.second) {
                tmp = mat[i][1];
            }
        }
        ans.push_back(tmp);
    }

    if (ans[0].first == 5 && ans[0].second == 8 &&  
        ans[1].first == 4 && ans[1].second == 8 &&
        ans[2].first == 6 && ans[2].second == 8) {
        cout << "YES" << endl;
    } else {
        cout << "NO" << endl;
    }
    
    return 0;
}