#include <bits/stdc++.h>

using namespace std;
map<long long,long long> ap;
long long x,nr,q;
int main()
{
    freopen("dtcsu.in","r",stdin);
    freopen("dtcsu.out","w",stdout);
    for(int i=1;i<=276997;i++)
    {
        scanf("%lld",&x);
        ap[x]=1;
    }
    cin>>q;
    for(int i=1;i<=q;i++)
    {
        cin>>x;
        if(ap.find(x)!=ap.end()) nr++;
    }
    printf("%lld",nr);

}