#define _CRT_SECURE_NO_WARNINGS
#define _USE_MATH_DEFINES

#include "bits/stdc++.h"
#define REP(i,a,b) for(i=a;i<b;++i)
#define rep(i,n) REP(i,0,n)
#define ll long long
#define ull unsigned ll
typedef long double ld;
#define ALL(a) begin(a),end(a)
#define ifnot(a) if(not a)
#define dump(x)  cerr << #x << " = " << (x) << endl
using namespace std;

// #define int ll
bool test = 0;
int dx[] = { 0,1,0,-1 };
int dy[] = { 1,0,-1,0 };
#define INF (1 << 28)
ull mod = (int)1e9 + 7;
//.....................
#define MAX (int)1e6 + 5

signed main() {
	ll i, j, k;
	int N;
	cin >> N;
	bool possible_num[13];
	rep(i, 13) possible_num[i] = true;
	rep(i, N) {
		vector<int> query_num(4);
		rep(j, 4) cin >> query_num[j];
		// rep(j, 4) cerr << query_num[j] << " ";
		cerr << endl;
		string res_str;
		cin >> res_str;
		if (res_str == "NO") {
			rep(j, 4) {
				possible_num[query_num[j]] = false;
			}
		}
		else if (res_str == "YES") {
			sort(ALL(query_num));
			rep(j, 13) {
				if (count(ALL(query_num),j) == 0) {
					possible_num[j] = false;
					dump(j);
				}
			}
		}
	}
	rep(i, 13) {
		if (possible_num[i]) {
			cout << i << endl;
			break;
		}
	}
}