N = int(input())
List = []
Numset = [0,1,2,3,4,5,6,7,8,9]
Ans = []
for i in range(N):
    List.append(input().split())
for i in range(N):
    if List[i][4] == "NO":
        a = int(List[i][0])
        b = int(List[i][1])
        c = int(List[i][2])
        d = int(List[i][3])
        if a in Numset:
            Numset.remove(a)
        if b in Numset:
            Numset.remove(b)
        if c in Numset:
            Numset.remove(c)
        if d in Numset:
            Numset.remove(d)
    if List[i][4] == "YES":
        for j in range(10):
            if j != int(List[i][0]) and j != int(List[i][1]) and j != int(List[i][2]) and j != int(List[i][3]):
                if j in Numset:
                    Numset.remove(j)
print(int(Numset[0]))