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#include <fstream>
#include <stdlib.h>
using namespace std;
ifstream f("dtcsu.in");
ofstream g("dtcsu.out");
long long int a[276998] ,n;
bool bin(int st,int dr,long long int e)
{
int m;
while(st<=dr)
{
m=(st+dr)/2;
if(a[m]==e)
return 1;
else
if(a[m]>e)
dr=m-1;
else
st=m+1;
}
return 0;
}
int i,q,nr=0;
char x[20];
int main()
{
for(i=1;i<=276997;i++)
{f>>x;
a[i]=atoll(x);}
f>>q;
for(i=1;i<=q;i++)
{
f>>x;
n=atoll(x);
if(bin(1,276997,n))
nr++;
}
g<<nr;
f.close();g.close();
}