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#include <bits/stdc++.h>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
const int MAX_M_N = 1025;
int a[MAX_M_N], b[MAX_M_N];
int aparitii;
int main()
{
int n, m;
fin >> n >> m;
for(int i = 1; i <= n; i ++)
fin >> a[i];
for(int i = 1; i <= m; i ++)
fin >> b[i];
for(int i = 1; i <= m; i ++)
for(int j = 1; j <= n; j ++)
if(b[i] == a[j])
aparitii ++;
fout << aparitii;
return 0;
}