n, m = list(map(int, input().split()))
ints = list(map(int, input().split()))

a = set(list(map(int, input().split())))
b = set(list(map(int, input().split())))

h = 0
for i in ints:
    if i in a: 
        h += 1
    elif i in b:
        h -= 1

print(h)