#include <bits/stdc++.h>
#define rep(i,n) for(int (i)=0;(i)<(n);(i)++)
using namespace std;
typedef long long ll;
int main(){
  //解答みました
  int n;
  cin >> n;
  vector<int> x1(n),y1(n),x2(n),y2(n);
  pair<int,int> a = make_pair(2,8),b = make_pair(3,9),c = make_pair(7,9);
  rep(i,n){
    cin >> x1[i] >> y1[i] >> x2[i] >> y2[i];
  }
    for(int i=0;i<n;i++){
      if(a==make_pair(x1[i],y1[i])){
        a = make_pair(x2[i],y2[i]);
      }
      if(b==make_pair(x1[i],y1[i])){
        b = make_pair(x2[i],y2[i]);
      }
      if(c==make_pair(x1[i],y1[i])){
        c = make_pair(x2[i],y2[i]);
      }
    }
  if(a==make_pair(5,8) && b==make_pair(4,8) && c==make_pair(6,8)){
    cout << "YES" << endl;
  }else{
    cout << "NO" << endl;
  }
  return 0;
}