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#include <fstream>
#include <unordered_map>
using namespace std;
#define NMax 276997
ifstream f("dtcsu.in");
ofstream g("dtcsu.out");
unordered_map<int, long long> M;
int q,nr;
int main()
{
long long x;
int i;
for(i=1;i<=NMax;++i)
{
f>>x;
M[x] = i;
}
f>>q;
while(q--)
{
f>>x;
if( M.find(x) != M.end() ) ++nr;
}
g<<nr<<"\n";
f.close();
g.close();
return 0;
}