#include <cassert>// c
#include <ctime>
#include <iostream>// io
#include <iomanip>
#include <fstream>
#include <sstream>
#include <vector>// container
#include <map>
#include <set>
#include <queue>
#include <bitset>
#include <stack>
#include <algorithm>// other
#include <utility>
#include <complex>
#include <numeric>
#include <functional>
#include <random>
#include <regex>

using namespace std;
typedef long long ll;

#define ALL(c) (c).begin(),(c).end()
#define FOR(i,l,r) for(int i=(int)l;i<(int)r;++i)
#define REP(i,n) FOR(i,0,n)
#define FORr(i,l,r) for(int i=(int)r-1;i>=(int)l;--i)
#define REPr(i,n) FORr(i,0,n)
#define EACH(i,c) for(__typeof((c).begin()) i=(c).begin(); i!=(c).end(); ++i)
#define IN(l,v,r) ((l)<=(v) && (v)<(r))
#define UNIQUE(v) v.erase(unique(ALL(v)),v.end())
//debug
#define DUMP(x)  cerr << #x << " = " << (x)
#define LINE()    cerr<< " (L" << __LINE__ << ")"

template<typename T,typename U> T pmod(T x,U M){return (x%M+M)%M;}


int main(){
	cin.tie(0); ios::sync_with_stdio(false);
	cout <<fixed <<setprecision(20);

	int N;cin >> N;
	vector<int> ws(N);REP(i,N) cin >> ws[i];
	int M;cin >> M;
	vector<int> bs(M);REP(i,M) cin >> bs[i];

	sort(ALL(ws));sort(ALL(bs));
	
	int Mv=0;
	//白start
	{
		int w=0,sz=0;
		int bi=0;
		REP(wi,N)if(w<ws[wi]){
			w=ws[wi];sz++;
			while(w >= bs[bi] && bi < M)bi++;
			if(w < bs[bi] && bi<M){
				w=bs[bi];sz++;
			}else{
				break;
			}
		}
		Mv=max(Mv,sz);
	}
	//黒start
	{
		int w=0,sz=0;
		int wi=0;
		REP(bi,M)if(w<bs[bi]){
			w=bs[bi];sz++;
			while(w >= ws[wi] && wi < N)wi++;
			if(w < ws[wi] && wi<N){
				w=ws[wi];sz++;
			}else{
				break;
			}
		}
		Mv=max(Mv,sz);
	}

	cout << Mv <<endl;

 	return 0;
 }