
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;


class Main {


   public static void main(String args[]) throws IOException{

	   BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

	   int n = Integer.parseInt( br.readLine() );
	   String[] string =  br.readLine().split(" ");
       int[] S = new int[n];


       for(int i = 0; i < n; i++ ){

    	   S[i] = Integer.parseInt( string[i] );

       }

       int q = Integer.parseInt( br.readLine() );
	   String[] stringq =  br.readLine().split(" ");
       int[] T = new int[q];


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

    	   T[i] = Integer.parseInt( stringq[i] );

       }


       int answer = 0;

       for(int i = 0; i < q ; i++ ){
    	   for(int j = 0; j < n ;  j++ ){
    		   if( S[j] == T[i]  ){
    			   answer++;
    			   break;
    		   }
    	   }

       }

     System.out.println(answer);


   }


}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz