#include <cassert>// c
#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 <complex>
#include <numeric>
#include <functional>
#include <random>
#include <regex>
using namespace std;

typedef long long ll;typedef unsigned long long ull;typedef long double ld;

#define ALL(c) c.begin(),c.end()
template<class T> bool IN(T l,T v,T r){return l<=v && v <r;}
template<class T> void UNIQUE(T v){v.erase(unique(ALL(v)),v.end());}
//debug
#define DUMP(x) cerr << #x <<" = " << (x)
#define LINE() cerr<< " (L" << __LINE__ << ")"

struct range{
	struct Iter{
		int v,step;
		Iter& operator++(){v+=step;return *this;}
		bool operator!=(Iter& itr){return v<itr.v;}
		int& operator*(){return v;}
	};
	Iter i, n;
	range(int i, int n,int step):i({i,step}), n({n,step}){}
	range(int i, int n):range(i,n,1){}
	range(int n):range(0,n){}
	Iter& begin(){return i;}
	Iter& end(){return n;}
};
struct rrange{
	struct Iter{
		int v,step;
		Iter& operator++(){v-=step;return *this;}
		bool operator!=(Iter& itr){return v>itr.v;}
		int& operator*(){return v;}
	};
	Iter i, n;
	rrange(int i, int n,int step):i({i-1,step}), n({n-1,step}){}
	rrange(int i, int n):rrange(i,n,1){}
	rrange(int n) :rrange(0,n){}
	Iter& begin(){return n;}
	Iter& end(){return i;}
};

//input
template<typename T1,typename T2> istream& operator >> (istream& is,pair<T1,T2>& p){return is>>p.first>>p.second;}
template<typename T1> istream& operator >> (istream& is,tuple<T1>& t){return is >> get<0>(t);}
template<typename T1,typename T2> istream& operator >> (istream& is,tuple<T1,T2>& t){return is >> get<0>(t) >> get<1>(t);}
template<typename T1,typename T2,typename T3> istream& operator >> (istream& is,tuple<T1,T2,T3>& t){return is >>get<0>(t)>>get<1>(t)>>get<2>(t);}
template<typename T1,typename T2,typename T3,typename T4> istream& operator >> (istream& is,tuple<T1,T2,T3,T4>& t){return is >> get<0>(t)>>get<1>(t)>>get<2>(t)>>get<3>(t);}
template<typename T> istream& operator >> (istream& is,vector<T>& as){for(int i:range(as.size()))is >>as[i];return is;}
//output
template<typename T> ostream& operator << (ostream& os, const set<T>& ss){for(auto a:ss){if(a!=ss.begin())os<<" "; os<<a;}return os;}
template<typename T1,typename T2> ostream& operator << (ostream& os, const pair<T1,T2>& p){return os<<p.first<<" "<<p.second;}
template<typename K,typename V> ostream& operator << (ostream& os, const map<K,V>& m){bool isF=true;for(auto& p:m){if(!isF)os<<endl;os<<p;isF=false;}return os;}
template<typename T1> ostream& operator << (ostream& os, const tuple<T1>& t){return os << get<0>(t);}
template<typename T1,typename T2> ostream& operator << (ostream& os, const tuple<T1,T2>& t){return os << get<0>(t)<<" "<<get<1>(t);}
template<typename T1,typename T2,typename T3> ostream& operator << (ostream& os, const tuple<T1,T2,T3>& t){return os << get<0>(t)<<" "<<get<1>(t)<<" "<<get<2>(t);}
template<typename T1,typename T2,typename T3,typename T4> ostream& operator << (ostream& os, const tuple<T1,T2,T3,T4>& t){return os << get<0>(t)<<" "<<get<1>(t)<<" "<<get<2>(t)<<" "<<get<3>(t);}
template<typename T> ostream& operator << (ostream& os, const vector<T>& as){for(int i:range(as.size())){if(i!=0)os<<" "; os<<as[i];}return os;}
template<typename T> ostream& operator << (ostream& os, const vector<vector<T>>& as){for(int i:range(as.size())){if(i!=0)os<<endl; os<<as[i];}return os;}

// values
template<typename T> inline T INF(){assert(false);};
template<> inline int INF<int>(){return 1<<28;};
template<> inline ll INF<ll>(){return 1LL<<58;};
template<> inline double INF<double>(){return 1e16;};
template<> inline long double INF<long double>(){return 1e16;};

template<class T> inline T EPS(){assert(false);};
template<> inline int EPS<int>(){return 1;};
template<> inline ll EPS<ll>(){return 1LL;};
template<> inline double EPS<double>(){return 1e-8;};
template<> inline long double EPS<long double>(){return 1e-8;};

// min{2^r | n < 2^r}
template<typename T> T upper_pow2(T n){ T res=1;while(res<n)res<<=1;return res;}
// max{d | 2^d  <= n}
template<typename T> T msb(T n){ int d=63;while((1LL<<d)>n)d--;return d;}

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

ll gcd_positive(ll a,ll b) { return b == 0 ? a : gcd_positive(b,a%b); }
ll gcd(ll a,ll b) { return gcd_positive(abs(a), abs(b)); }
ll lcm(ll a,ll b){return a/gcd(a,b)*b;}


typedef long double D;
static constexpr D Ae=0;
D A(D a,D b){return a+b;}D Ainv(D a){return -a;}
D S(D a,D b){return A(a,Ainv(b));}

static constexpr D Me=1;
D M(D a,D b){return a*b;}D Minv(D a){return 1.0/a;};

int sig(D a,D b=0){return a<b-EPS<D>()?-1:a>b+EPS<D>()?1:0;}
template<typename T> bool eq(const T& a,const T& b){return sig(abs(a-b))==0;}

typedef complex<D> P,Vec;
const P O=P(0,0);
#define X real()
#define Y imag()
istream& operator >> (istream& is,complex<D>& p){
	D x,y;is >> x >> y;p=P(x,y);return is;
}
bool compX (const P& a,const P& b){return !eq(a.X,b.X)?sig(a.X,b.X)<0:sig(a.Y,b.Y)<0;}
bool compY (const P& a,const P& b){return !eq(a.Y,b.Y)?sig(a.Y,b.Y)<0:sig(a.X,b.X)<0;}

// a×b
D cross(const Vec& a,const Vec& b){return imag(conj(a)*b);}
// a・b
D dot(const Vec&a,const Vec& b) {return real(conj(a)*b);}

int ccw(const P& a,P b,P c){
	b -= a; c -= a;
	if (sig(cross(b,c))>0)   return +1;       // counter clockwise
	if (sig(cross(b,c))<0)   return -1;       // clockwise
	if (sig(dot(b,c)) < 0)     return +2;       // c--a--b on line
	if (sig(norm(b),norm(c))<0) return -2;       // a--b--c on line
	return 0;
}

namespace std{
	bool operator < (const P& a,const P& b){return compX(a,b);}
  	bool operator == (const P& a,const P& b){return eq(a,b);}
};

struct L : public vector<P> {
	P vec() const {return this->at(1)-this->at(0);}
	L(const P &a, const P &b){push_back(a); push_back(b);}
	L(){push_back(P(0,0));push_back(P(0,0));}
};
istream& operator >> (istream& is,L& l){P s,t;is >> s >> t;l=L(s,t);return is;}

bool isIntersectSS(const L &s, const L &t) {
  return ccw(s[0],s[1],t[0])*ccw(s[0],s[1],t[1]) < 0 &&
         ccw(t[0],t[1],s[0])*ccw(t[0],t[1],s[1]) < 0;
}
class Main{
	public:
	void run(){
		int N;cin >> N;
		int A;cin >> A;
		vector<int> bs(A);cin >> bs;
		int C;cin >> C;
		vector<int> ds(C);cin >> ds;
		sort(ALL(bs));sort(ALL(ds));

		vector<bool> bused(A),dused(C);
		int res = 0;
		while(N--){
			// can win?
			bool ok=false;int ai,cj;
			for(int i:range(A))if(!bused[i]){
				for(int j:rrange(C))if(!dused[j]){
					if(!ok && bs[i]>ds[j]){
						ai = i;
						cj = j;
						ok = true;
					}
				}
			}
			if(ok){
				bused[ai]=dused[cj]=true;res++;
			}else{
				//can't win
				int ai=-1;
				for(int i:range(A))if(!bused[i] && ai==-1)ai=i;
				int ci=-1;
				for(int i:rrange(C))if(!dused[i] && ci==-1)ci=i;
				bused[ai]=dused[ci]=true;
			}

			//all used?
			bool exb=false;
			for(int i:range(A))if(!bused[i])exb=true;
			if(!exb)for(int i:range(A))bused[i]=false;
			
			bool exd=false;
			for(int i:range(C))if(!dused[i])exd=true;
			if(!exd)for(int i:range(C))dused[i]=false;
		}

		cout << res <<endl;

	}
};

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