#include <stdio.h>
#define N 10000

int main( void )
{
    int i,j,c=0,N,q,S[N],t;
    
    scanf( "%d", &n );
    
    for ( i = 0; i < n; i++ ) {
        scanf( "%d", &s[i] );
    }
    
    scanf( "%d", &q );
    
    for ( i = 0; i < q; i++ ) {
        scanf( "%d", &t );
        for ( j = 0; j < n; j++ ) {
            if ( t == s[j] ) {
                t = -1;
            }
        }
        if ( t == -1 ) {
            c++;
        }
    }
    
    printf( "%d\n", c );
    
    return 0;
}

