#include "bits/stdc++.h"
using namespace std;



int main() {
	int N;
	cin >> N;
	int A;
	cin >> A;
	vector<int> B(A);
	for (int i = 0; i < A; i++)
	{
		cin >> B[i];
	}
	int C;
	cin >> C;
	vector<int> D(C);
	for (int i = 0; i < C; i++)
	{
		cin >> D[i];
	}

	vector<int> ta(B);
	vector<int> tb(D);
	int ans = 0;
	for (int i = 0; i < N; i++)
	{
		if (ta.size() == 0) ta = B;
		if (tb.size() == 0) tb = D;
		sort(ta.begin(), ta.end());
		sort(tb.begin(), tb.end());

		int usea = -1;
		int useb = -1;
		for (int j = 0; j < ta.size(); j++)
		{
			for (int k = tb.size() - 1; k >= 0; k--)
			{
				if (ta[j] > tb[k]){
					usea = j;
					useb = k;
					break;
				}
			}
			if (usea != -1) break;
		}

		if (usea != -1){
			ans++;
		}
		else{
			usea = 0;
			useb = tb.size() - 1;
		}
		swap(ta[usea], ta[ta.size() - 1]);
		swap(tb[useb], tb[tb.size() - 1]);
		ta.pop_back();
		tb.pop_back();
	}
	cout << ans << endl;
}