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)

def binary_search(arr, target)
  left = 0
  right = arr.size

  while left < right
    mid = (left + right) / 2

    if arr[mid] == target
      return mid
    elsif target < arr[mid]
      right = mid
    else
      left = mid + 1
    end
  end

  nil
end

gets
s = gets.split.map(&:to_i)

gets
t = gets.split.map(&:to_i)

count = 0

t.each do |n|
  count += 1 if binary_search(s, n)
end

puts count