#include <bits/stdc++.h>

using namespace std;

#define ll long long

vector<ll>v[277000];

ll x,n,total,i,nr;

int main()
{
    freopen("dtcsu.in","r",stdin);
    freopen("dtcsu.out","w",stdout);
    for (i=1;i<=276997;i++){
        scanf("%lld",&x);
        v[x%276997].push_back(x);
    }
    scanf("%lld",&n);
    while (n){
        n--;
        scanf("%lld",&x);
        nr=v[x%276997].size();
        for (i=0;i<nr;i++) {
            if (v[x%276997][i]==x) {total++;break;}
        }
    }
    printf("%lld",total);
    return 0;
}