#include <bits/stdc++.h>
using namespace std;
#define BUFF_SIZE (1<<13)
char buff[BUFF_SIZE];
int poz=BUFF_SIZE;
char GetChar(){
    if(poz==BUFF_SIZE){
        fread(buff,1,BUFF_SIZE,stdin);
        poz=0;
    }
    return buff[poz++];
}
long long GetInt(){
    long long n=0;
    char c;
    do{
        c=GetChar();
    }while(!isdigit(c));
    do{
        n=n*10+c-'0';
        c=GetChar();
    }while(isdigit(c));
    return n;
}
unordered_set<int> ap;
int main(){
    freopen("dtcsu.in","r",stdin);
    freopen("dtcsu.out","w",stdout);
    for(int i=1;i<=276997;++i)
        ap.insert(GetInt());
    int q;
    q=GetInt();
    int sol=0;
    while(q--){
        if(ap.find(GetInt())!=ap.end())
            ++sol;
    }
    printf("%d\n",sol);
    return 0;
}