
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);


   }


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


   }


} 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);


   } main {

	   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);


   } BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); br new BufferedReader(new InputStreamReader(System.in)) int n = Integer.parseInt( br.readLine() ); n Integer.parseInt( br.readLine() ) Integer.parseInt Integer br.readLine() br.readLine br String[] string =  br.readLine().split(" "); string br.readLine().split(" ") br.readLine().split br.readLine() br.readLine br " " int[] S = new int[n]; S new int[n] n for(int i = 0; i < n; i++ ){

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

       } int i = 0; int i = 0; i 0 i < n i n i++ i++ i {

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

       } {

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

       } S[i] = Integer.parseInt( string[i] ) S[i] S i Integer.parseInt( string[i] ) Integer.parseInt Integer string[i] string i int q = Integer.parseInt( br.readLine() ); q Integer.parseInt( br.readLine() ) Integer.parseInt Integer br.readLine() br.readLine br String[] stringq =  br.readLine().split(" "); stringq br.readLine().split(" ") br.readLine().split br.readLine() br.readLine br " " int[] T = new int[q]; T new int[q] q for(int i = 0; i < q; i++ ){

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

       } int i = 0; int i = 0; i 0 i < q i q i++ i++ i {

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

       } {

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

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

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

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

       } for(int j = 0; j < n ;  j++ ){
    		   if( S[j] == T[i]  ){
    			   answer++;
    			   break;
    		   }
    	   } int j = 0; int j = 0; j 0 j < n j n j++ j++ j {
    		   if( S[j] == T[i]  ){
    			   answer++;
    			   break;
    		   }
    	   } {
    		   if( S[j] == T[i]  ){
    			   answer++;
    			   break;
    		   }
    	   } if( S[j] == T[i]  ){
    			   answer++;
    			   break;
    		   } S[j] == T[i] S[j] S j T[i] T i {
    			   answer++;
    			   break;
    		   } answer++ answer break; System.out.println(answer) System.out.println System.out System System.out answer String args[] args

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);


   }


}