#include <iostream>
using namespace std;
int main()
{ int a[101] , j , i , b[101] , k=0;
int na , nb;
cout<<"na = " ;cin >> na;
cout<<"nb= " ; cin >>nb;
for(i=1;i<=na;i++)
{ cout<<"a[ " <<i<<" ]= ";
cin>>a[i];}
for(i=1;i<=nb;i++)
{cout<<"b[ " <<i<<" ]= ";
cin>>b[i];}
for(i=1;i<=na;i++)
{
for(j=1;j<=nb;j++)
if(a[i]==b[j])
k++;}
cout<<k;
return 0;}