user01 = input()
user02 = input()
user01 = user01.split(" ")
user02 = user02.split(" ")

i = 0
r = 0
temp = []
while True:
    if i >= len(user01):
        break
    if user01[i] in user02 and user01[i] not in temp:
        r += 1
        temp.append(user01[i])
    i += 1
print(r)