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;

//二分探索  
int binarysearch(int k){
  int left=0;
  int mid;
  int right=n;

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

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

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

  //数列Tを決定
  scanf("%d",&q);
  for(i=0;i<q;i++){
    scanf("%d",&key);
    if(binarysearch(key)== 1) sum++;
  }

  printf("%d\n",sum);
  
  return 0;
}