import java.util.Scanner;

public class Main {
    public static void main(String[] p) {
        Scanner q = new Scanner(System.in);
        int n = q.nextInt();
        char f = 0x3FF;
        char z = 0x0;
        for (int i = 0; i < n; i++) {
            int a = q.nextInt();
            int b = q.nextInt();
            int c = q.nextInt();
            int d = q.nextInt();
            f &= ("YES".equals((q.next()))) ? (z | 1 << a | 1 << b | 1 << c | 1 << d) : ~(z | 1 << a | 1 << b | 1 << c | 1 << d);
        }
        for (int i = 0; i < 11; i++) {
            if ((f & 1 << i) != 0) {
                System.out.println(i);
                break;
            }
        }
    }
}