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#include <fstream>
#include<set>
#include<unordered_set>
using namespace std;
ifstream fin("dtcsu.in");
ofstream fout("dtcsu.out");
unordered_set<int> Set;
int n,i,sol,x;
int main()
{
for(i=1;i<=276997;++i)
{
fin>>x;
Set.insert(x);
}
fin>>n;
for(i=1;i<=n;++i)
{
fin>>x;
if(Set.find(x)!=Set.end()) sol++;
}
fout<<sol;
return 0;
}