def main(arr,like,unlike): add = 0 minus = 0 # like = len(arr.intersection(like)) # unlike = len(arr.intersection(unlike)) for i in arr: if i in like: add += 1 if i in unlike: minus +=1 print(add - minus) if __name__ =="__main__": n,m = input().split() arr = list(map(int,input().split())) like = set(map(int,input().split())) unlike = set(map(int,input().split())) main(arr,like,unlike)