import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        boolean[] isNotTrue = new boolean[10];
        for (int i = 0; i < n; i++) {
            HashSet<Integer> used = new HashSet<>();
            for (int j = 0; j < 4; j++) {
                used.add(sc.nextInt());
            }
            if ("YES".equals(sc.next())) {
                for (int j = 0; j < 10; j++) {
                    if (!used.contains(j)) {
                        isNotTrue[j] = true;
                    }
                }
            } else {
                for (int j = 0; j < 10; j++) {
                    if (used.contains(j)) {
                        isNotTrue[j] = true;
                    }
                }
            }
        }
        for (int i = 0; i < 10; i++) {
            if (!isNotTrue[i]) {
                System.out.println(i);
                return;
            }
        }
    }
}