#include <fstream>
#include <unordered_set>
using namespace std;
ifstream in("dtcsu.in");
ofstream out("dtcsu.out");
unordered_set <long long> mySet;
int nr;
int main()
{
    for(int i = 1; i <= 276997; i++)
    {
        int x;
        in>>x;
        mySet.insert(x);
    }
    int m;
    in>>m;
    while(m--){
        int n;
        in>>n;
        if(mySet.find(n) != mySet.end())
            nr++;
    }
    out<<nr;
    return 0;
}