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 C (judge verdict: Accepted)

#include <stdio.h>

int A[1000000],n;

int dob(int);

int main()
{
  int i,q,k,sum = 0;

  scanf("%d",&n);
  for(i=0;i<n;i++)
    {
      scanf("%d",&A[i]);
    }

  scanf("%d",&q);
  for(i=0;i<q;i++)
    {
      scanf("%d",&k);
      if(dub(k)) sum++;
    }
  printf("%d\n",sum);

  return 0;
}

int dub(int key)
{
  int left = 0;
  int right = n;
  int mid;
  while(left<right)
    {
      mid = (left+right)/2;
      if(key==A[mid]) return 1;
      if(key > A[mid]) left = mid+1;
      else if (key <A[mid]) right=mid;
    }
  return 0;
}