#include<stdio.h>

int Linear(int key,int s[10001],int n) {
int i=0;
s[n]=key;
while (s[i] != key) 
i++;
if(i == n) {
return 0;
}

return 1;
}
int main() {
int s[100001],t[501],i,n,q,ans=0;
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[i]);
for (i = 0; i < q; i++) {
ans=ans+Linear(t[i],s,n);
}
printf("%d?\n",ans);
return 0;
}