n,m=map(int,input().split())
list1=list(map(int,input().split()))[:n]
list2=list(map(int,input().split()))[:n]
list3=list(map(int,input().split()))[:n]

name=1#目前的出牌人
card_dict={'n':0,'type':0,'len':1}
def win():
    if len(list1)==0 or len(list2)==0 or len(list3)==0:
        return 1
def find_who(na):
    if na==1:
        find_list=list1
    elif na==2:
        find_list=list2
    else:
        find_list=list3
    return find_list
def quiter():
    i=0
    if card_dict['n']==0:
        pass
    quit_list=find_who(card_dict['n'])
    for i in range(card_dict['len']):
        quit_list.remove(card_dict['type'])

def judge(na):#判断是否能打出
    global name
    judge_list=find_who(na)
    flag=0
    if na==card_dict['n']:
        card_dict['type'] = 1
        card_dict['len'] =0
    for num in range(m+1):
        if num in judge_list:
            if num>card_dict['type'] and judge_list.count(num)>=card_dict['len']:
                flag=1
                break

    if flag==1:#从等级上压制
        card_dict['n'] = na
        card_dict['type']=num
        name+=1
    if flag !=1:
        for num in range(m+1):
            if num in judge_list and judge_list.count(num)>card_dict['len']:
                flag=2
                break
    if flag==2:#从数量上压制

        card_dict['n']=na
        card_dict['type']=num
        card_dict['len']=card_dict['len']+1
        name += 1
    if flag==0:#失败了,跳过
        name += 1
    if flag!=0:
        quiter()
    flag = 0  # 重置
while True:
    if win()==1:
        print(card_dict['n'])
        break
    if name==4:
        name=1
    judge(name)