#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint1000000007;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000000000000
	

int main(){	
	
	int N;
	cin>>N;
	
	int A;
	cin>>A;
	
	vector<int> a(A);
	rep(i,A){
		cin>>a[i];
		a[i] *= -1;
	}
	int C;
	cin>>C;
	vector<int> c(C);
	rep(i,C){
		cin>>c[i];
		c[i] *= -1;
	}
	int ans = 0;
	vector<int> aa,cc;
	rep(_,N){
		if(aa.size()==0){
			_--;
			aa = a;
			continue;
		}
		if(cc.size()==0){
			cc = c;
			_--;
			continue;
		}
		sort(aa.begin(),aa.end());
		sort(cc.begin(),cc.end());
		if(aa.size()<cc.size()){
			int d = distance(cc.begin(),upper_bound(cc.begin(),cc.end(),aa[0]));
			aa.erase(aa.begin());
			if(d!=cc.size()){
				ans++;
				cc.erase(cc.begin()+d);
			}
			else{
				cc.erase(cc.begin());
			}
		}
		else{
			int d = distance(aa.begin(),lower_bound(aa.begin(),aa.end(),cc.back()));
			cc.pop_back();
			if(d!=0){
				ans++;
				aa.erase(aa.begin()+d-1);
			}
			else{
				aa.pop_back();
			}
		}
	}
	cout<<ans<<endl;
	
	return 0;
	
}