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

int main(void)
{
  int n, q, t, cnt = 0;
  int s[1000000];
  
  scanf("%d", &n);
  
  for (int i = 0; i < n; i++)
    scanf("%d", &s[i]);
  
  scanf("%d", &q);
  
  while(q--) {
    scanf("%d", &t);
    if (binarysearch(s, t, n))
      cnt++;
  }
  
  printf("%d\n", cnt);
  
  return 0;
}