#include<iostream>
#include<string>
#include<vector>
#include<algorithm>
#include<map>
#define all(x) x.begin(),x.end()
#define pb push_back
#define ll long long 
#define P pair<int,int>
#define LP pair<ll,ll>
using namespace std;
int main() {
	ll n;
	cin >> n;
	P a = P(2, 8), b = P(3, 9), c = P(7, 9);
	for (int i = 0; i < n; i++) {
		P f, g;
		cin >> f.first >> f.second >> g.first >> g.second;
		if (a == f) a = g;
		else if (b == f) b = g;
		else if (c == f) c = g;
	}
	if (a == P(5, 8) and b == P(4, 8) and c == P(6, 8)) {
		cout << "YES" << endl;
	}
	else cout << "NO" << endl;



	
	return 0;
}