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 main(){

  int n,q,i,key,a,b,X;

  int S[100000],ans = 0;

  scanf("%d" ,&n);

  for(i = 0 ; i < n ; i++){
   
   scanf("%d" , S + i);

  }

  scanf("%d" ,&q);

  for(i = 0 ; i < q ; i++){

    scanf("%d" ,&key);
    a = 0; b = n;
    
     while(b >= a){
     
      X = (a + b) / 2;

      if(S[X] == key){
    ans++;
    break;
  
     }

    if(S[X] < key){
     a = X+1;
    }else{

     b = X-1;
      }
    }
   }
   
  printf("%d\n" ,ans);

  return 0;
}