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#include <iostream>
#include <fstream>
#include <cstdlib>
#include <cstdio>
using namespace std;
int main()
{
long long v[300000];
long long i,n,x,j;
long long nr=0;
ifstream f("dtcsu.in");
for (i=0; i<276997; i++) {
f>>v[i];
}
f>>n;
for (i=0; i<n; i++) {
f>>x;
for (j=0; j<276997 && v[j]<=x; j++)
if (v[j]==x) ++nr;
}
ofstream g("dtcsu.out");
g<<nr<<'\n';
return 0;
}