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#include <bits/stdc++.h>
using namespace std;
ifstream fin("dtcsu.in");
ofstream fout("dtcsu.out");
vector<long long> v;
int q;
long long x;
int cnt;
int main()
{
for (int i=1;i<=276997;i++)
{
fin>>x;
v.push_back(x);
}
sort(v.begin(),v.end());
fin>>q;
while (q--)
{
fin>>x;
if (binary_search(v.begin(),v.end(),x)) cnt++;
}
fout<<cnt;
return 0;
}