#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;
}