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 Ruby (judge verdict: Accepted)

class String
  def to_ia
    split(/\s/).map {|s| s.to_i}
  end
end
  
class Array
  def binary_search(val)
    left = 0
    right = size
    while left < right
      mid = (left + right) / 2
      if self[mid] == val
        return val
        #return mid
      elsif val < self[mid]
        right = mid
      else
        left = mid + 1
      end
    end
    nil
  end

  def binary_search_rec(val, left, right)
    return nil unless left < right
    mid = (left + right) / 2
    return mid if self[mid] == val
    if val < self[mid]
      binary_search_rec(val, left, mid)
    else
      binary_search_rec(val, mid+1, right)
    end
  end
end

STDIN.readline
subject = STDIN.readline.to_ia
STDIN.readline
search = STDIN.readline.to_ia

ans = 0
search.each do |v|
  #ans += 1 unless subject.binary_search(v).nil?
  ans += 1 unless subject.binary_search_rec(v, 0 , subject.size).nil?
end
puts ans