#include <bits/stdc++.h>
using namespace std;

int main() {
    int N, A[10][4], R[10] = {};
    cin >> N;
    for (int i = 0; i < N; i++) {
        for (int j = 0; j < 4; j++) {
            cin >> A[i][j];
        }
        string s;
        cin >> s;
        if (s == "YES")
            R[i] = 1;
    }
    for (int i = 0; i < 10; i++) {
        bool flag = true;
        for (int j = 0; j < N; j++) {
            int tmp = 0;
            for (int k = 0; k < 4; k++) {
                if (A[j][k] == i)
                    tmp = 1;
            }
            if (tmp != R[j])
                flag = false;
        }
        if (flag) {
            cout << i << endl;
            return 0;
        }
    }
}