#include <bits/stdc++.h>
#define syosu(x) fixed<<setprecision(x)
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int,int> P;
typedef pair<double,double> pdd;
typedef pair<ll,ll> pll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<double> vd;
typedef vector<vd> vvd;
typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef vector<string> vs;
typedef vector<P> vp;
typedef vector<vp> vvp;
typedef vector<pll> vpll;
typedef pair<int,P> pip;
typedef vector<pip> vip;
const int inf=1<<30;
const ll INF=1ll<<60;
const double pi=acos(-1);
const double eps=1e-6;
const ll mod=1e9+7;
const int dx[4]={0,1,0,-1},dy[4]={1,0,-1,0};

const int M=21;
int n,m,a[2][M];

int main(){
	cin>>n;
	for(int i=0;i<n;i++){
		int x;
		cin>>x;
		a[0][x]++;
	}
	cin>>m;
	for(int i=0;i<m;i++){
		int x;
		cin>>x;
		a[1][x]++;
	}
	int A=0,B=0,I=0,J=1;
	for(int i=M-1;i>0;i--){
		if(a[I][i]){
			A++;
			I^=1;
		}
		if(a[J][i]){
			B++;
			J^=1;
		}
	}
	cout<<max(A,B)<<endl;
}