HackerRank No Idea

happy=0;
n,m=map(int,input().split());
lst=list(map(int,input().split()));
A=set(map(int,input().split()));
B=set(map(int,input().split()));
for i in lst:
    if (i in A)==1:
        happy+=1;
    elif (i in B)==1:
        happy-=1;
    else:
        continue;
print(happy);