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: Wrong Answer)

n = gets.to_i
base = gets.chomp.split(" ").map(&:to_i)
m = gets.to_i
compare = gets.chomp.split(" ").map(&:to_i)
count = 0

(0..m-1).each do |i|
  left = 0
  right = n-1
  if base[n-1] > compare[i] then
    while left < right
      mid = ((left+right)/2).floor
      if compare[i] == base[mid] then
        count += 1
        break
      elsif compare[i] < base[mid] then
        right = mid
      else
        left = mid + 1
      end
    end
  end
end

puts count