include<stdio.h>
int search(int A[], int n, int key){
int i=0;
A[n]=key;
while (A[i] !=key)i++;
return i !=n;
}

int main(void){
int i,n,A[1000+1],j,key,sum=0;
scanf("%d",&n);
for(i=0;i<n;i++) scanf("%d",&A[i]);

scanf("%d" ,&j);
for(i=0;i<j;i++){
scanf("%d",&key);
if(search(A,n,key))sum++;
}
printf("%d\n",sum);
return 0;
}