#include<bits/stdc++.h>
using namespace std;
ifstream fin("dtcsu.in");
ofstream fout("dtcsu.out");
unordered_map<long long,int>mp;
int n,f,cnt;
int main()
{
    n=276997;
    while(n--)
    {
        fin>>f;
        mp[f]=1;
    }
    fin>>n;
    while(n--)
    {
        fin>>f;
        if(mp.find(f)!=mp.end())
            cnt++;
    }
    fout<<cnt;
}