Problem:
Search II

You are given a sequence of n integers S and a sequence of different q integers T. Write a program which outputs C, the number of integers in T which are also in the set S.

Input

In the first line n is given. In the second line, n integers are given. In the third line q is given. Then, in the fourth line, q integers are given.

Output

Print C in a line.

Constraints

Elements in S is sorted in ascending order

n ≤ 100000

q ≤ 50000

0 ≤ an element in S ≤ 109

0 ≤ an element in T ≤ 109

Sample Input 1

5
1 2 3 4 5
3
3 4 1

Sample Output 1

3

Sample Input 2

3
1 2 3
1
5

Sample Output 2

0

Sample Input 3

5
1 1 2 2 3
2
1 2

Sample Output 3

2

Notes

Solution in Python3 (judge verdict: Accepted)

############################
# 再帰的に呼出す関数
def half(a,b,low,high):

    if(low > high):
        return 0

    c = int((low+high)/2)

    if(a[c] == b):
        return 1
    elif(a[c] < b):
        return half(a,b,c+1,high)
    elif(a[c] > b):
        return half(a,b,low,c-1)
#############################


n = int(input())
s = list(map(int,input().split()))
q = int(input())
r = list(map(int,input().split()))
cou = 0

for i in range(q):
    cou += half(s,r[i],0,n-1)

print(cou)