#include <bits/stdc++.h>
#define REP(i,n,N) for(int i=(n);i<(int) N;i++)
#define p(s) cout<<(s)<<endl
#define F first
#define S second
using namespace std;

int main(void){
	int Nw,Nb;
	vector<pair<int,int>> v1,v2;
	cin>>Nw;;
	REP(i,0,Nw){
		int a;
		cin>>a;
		v1.push_back({a,0});
		v2.push_back({a,1});
	}
	cin>>Nb;
	REP(i,0,Nb){
		int a;
		cin>>a;
		v1.push_back({a,1});
		v2.push_back({a,0});
	}
	sort(v1.begin(),v1.end());
	sort(v2.begin(),v2.end());
	int now=1,mx=0;
	int w=0;
	REP(i,0,v1.size()){
		if(1-now==v1[i].S&&mx<v1[i].F){
			now=1-now;
			mx=v1[i].F;
			w++;
		}
	}
	int b=0;
	now=0;mx=0;
	REP(i,0,v1.size()){
		if(1-now==v2[i].S&&mx<v2[i].F){
			now=1-now;
			mx=v2[i].F;
			b++;
		}
	}
	p(max(w,b));
	return 0;
}