#include <bits/stdc++.h>
#define rep(i,n) for(int i=0; i<(n); i++)
using namespace std;
typedef long long ll;

int main(){
	int n; cin>>n;
	string a,b,c; a="28"; b="39"; c="79";
	rep(i,n){
		string p,m,t;
		cin>>p>>t; p+=t;
		cin>>m>>t; m+=t;
		if(p==a) a=m;
		else if(p==b) b=m;
		else if(p==c) c=m;
	}
	if(a=="58"&&b=="48"&&c=="68") cout << "YES" << endl;
	else cout << "NO" << endl;
}