import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int N = sc.nextInt();
    ArrayList[] arr = new ArrayList[N];
    int[] res = new int[N];
    for(int i = 0; i < N; i++) {
      ArrayList<Integer> list = new ArrayList<Integer>();
      list.add(sc.nextInt());
      list.add(sc.nextInt());
      list.add(sc.nextInt());
      list.add(sc.nextInt());
      arr[i] = list;
      String r = sc.next();
      if(r.equals("YES")) {
        res[i] = 1; 
      }
    }
    int ans = 0;
    for(int i = 0; i < 10; i++) {
      boolean flg = true;
      for(int j = 0; j < N; j++) {
        ArrayList<Integer> list = arr[j];
        if(list.contains(i)) {
          if(res[j] == 0) flg = false;
        } else {
          if(res[j] == 1) flg = false;
        }
      }
      if(flg) {
        ans = i;
        break;
      }
    }
    System.out.println(ans);
  }
}