# include <cstdio>
# include <unordered_set>
using namespace std;
unordered_set <long long> S;
int main(void)
{
    freopen("dtcsu.in","r",stdin);
    freopen("dtcsu.out","w",stdout);
    long long x;
    for (int i=1;i<=276997;++i)
    {
        scanf("%lld\n",&x);
        S.insert(x);
    }
    int n;
    scanf("%lld",&n);
    int p=0;
    while (n--)
        {
            scanf("%lld",&x);
            p+=(x && S.find(x)!=S.end());
        }
     printf("%lld",p);
     return 0;
}