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(array, target)
  num_of_elements = array.length
  left = 0
  right = num_of_elements-1
  while left <= right
    center = (left + right)/2
    if array[center] == target
      return true
    elsif array[center] < target
      left = center+1
    else
      right = center-1
    end
  end
end

n = gets.chomp.to_i
s = gets.chomp.split.map(&:to_i)
q = gets.chomp.to_i
t = gets.chomp.split.map(&:to_i)

sum_count = 0
for i in 0..(q-1)
  if binary_search(s, t[i]) == true
    sum_count += 1
  end
end

puts sum_count