#include<cstdio>
#include<vector>
#include<algorithm>
#define DIM 10005
#define MOD 10003
using namespace std;

int Q,sol;
long long x;
vector<long long> H[10003];

int poz=DIM-1;
char buffer[10005];
FILE *cin=fopen("dtcsu.in","r");
FILE *cout=fopen("dtcsu.out","w");

long long read_number(){

    long long number=0;
    while(buffer[poz]<'0' || buffer[poz]>'9'){

        ++poz;
        if(poz==DIM){

            fread(buffer,1,DIM,cin);
            poz=0;

        }

    }

    while(buffer[poz]>='0' && buffer[poz]<='9'){

        number=number*10+(buffer[poz]-'0');
        ++poz;
        if(poz==DIM){

            fread(buffer,1,DIM,cin);
            poz=0;

        }

    }
    return number;

}

int main (){

    for(int i=1;i<=276997;i++){

        x=read_number();
        H[x%MOD].push_back(x);

    }
    Q=read_number();
    while(Q--){

        x=read_number();
        if(find(H[x%MOD].begin(),H[x%MOD].end(),x)!=H[x%MOD].end())
            ++sol;

    }
    fprintf(cout,"%d",sol);

}