# Set .intersection() Operation

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#
#   .intersection()
#   The .intersection() operator returns the intersection of a set and the set of elements in an iterable.
#   Sometimes, the & operator is used in place of the .intersection() operator,
#   but it only operates on the set of elements in set.
#   The set is immutable to the .intersection() operation (or & operation).
#
#   >>> s = set("Hacker")
#   >>> print s.intersection("Rank")
#   set(['a', 'k'])
#
#   >>> print s.intersection(set(['R', 'a', 'n', 'k']))
#   set(['a', 'k'])
#
#   >>> print s.intersection(['R', 'a', 'n', 'k'])
#   set(['a', 'k'])
#
#   >>> print s.intersection(enumerate(['R', 'a', 'n', 'k']))
#   set([])
#
#   >>> print s.intersection({"Rank":1})
#   set([])
#
#   >>> s & set("Rank")
#   set(['a', 'k'])
#
#   Task
#   The students of District College have subscriptions to English and French newspapers. Some students have
#   subscribed only to English, some have subscribed only to French, and some have subscribed to both newspapers.
#   You are given two sets of student roll numbers. One set has subscribed to the English newspaper,
#   one set has subscribed to the French newspaper.
#   Your task is to find the total number of students who have subscribed to both newspapers.
#
#   Input Format
#   The first line contains n, the number of students who have subscribed to the English newspaper.
#   The second line contains n space separated roll numbers of those students.
#   The third line contains b, the number of students who have subscribed to the French newspaper.
#   The fourth line contains b space separated roll numbers of those students.
#
#   Constraints
#   0 < Total no of students in college < 1000
#
#   Output Format
#   Output the total number of students who have subscriptions to both English and French newspapers.
#
#   Sample Input
#   9
#   1 2 3 4 5 6 7 8 9
#   9
#   10 1 2 3 11 21 55 6 8
#
#   Sample Output
#   5
#
#   Explanation
#   The roll numbers of students who have both subscriptions:
#   1,2,3,6 and 8.
#   Hence, the total is 5 students.
#
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nE = int(input())
englu = set(map(int, input().split()))
nE = int(input())
frenchu = set(map(int, input().split()))

print(len(englu.intersection(frenchu)))
