#include <bits/stdc++.h>

#define MaxN 100005
#define INF 2140000000
#define MOD 1000000007


using namespace std;

FILE*IN,*OUT;

int Ans=0;
long long X,Q;
map<long long,bool>Hash;

int main()
{

    IN=fopen("dtcsu.in","r");
    OUT=fopen("dtcsu.out","w");

    for(int i=1;i<=276997;i++)
        fscanf(IN,"%lld",&X),Hash[X]=1;
    fscanf(IN,"%d",&Q);
    for(int i=1;i<=Q;i++)
    {
        fscanf(IN,"%d",&X);
        if(Hash[X])Ans++;
    }
    fprintf(OUT,"%d",Ans);
    return 0;
}