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

const int MAX = 3010;

int dp[MAX][MAX];
int solve[MAX][MAX];
int ans[MAX][MAX];
int main() {
	int n; cin >> n;
	int a[n + 1];
	for(int i = 0; i <= n; ++i) cin >> a[i];
	int b[n + 1];
	for(int i = 0; i <= n; ++i) cin >> b[i];
	int d[n];
	for(int i = 0; i < n; ++i) cin >> d[i];
	sort(d, d + n);
	reverse(d, d + n);
	dp[0][0] = a[0] + b[0];
	for(int i = 0; i < MAX; ++i) {
		for(int j = 0; j < MAX; ++j) {
			solve[i][j] = n;
		}
	}
	solve[0][0] = -1;
	ans[0][0] = 0;
	for(int i = 0; i <= n; ++i) {
		for(int j = 0; j <= n; ++j) {
			if(i == 0 and j == 0) continue;
			if(i - 1 >= 0) {
				dp[i][j] = max(dp[i][j], dp[i - 1][j] - a[i - 1] + a[i]);
				int ng = solve[i - 1][j], ok = n;
				while(abs(ok - ng) > 1) {
					int mid = (ok + ng) / 2;
					if(d[mid] <= dp[i][j]) {
						ok = mid;
					} else {
						ng = mid;
					}
				}
				solve[i][j] = min(solve[i][j], ok);
				if(solve[i][j] != n) {
					ans[i][j] = max(ans[i][j], ans[i - 1][j] + 1);
				}
			}
			if(j - 1 >= 0) {
				dp[i][j] = max(dp[i][j], dp[i][j - 1] - b[j - 1] + b[j]);
				int ng = solve[i][j - 1], ok = n;
				while(abs(ok - ng) > 1) {
					int mid = (ok + ng) / 2;
					if(d[mid] <= dp[i][j]) {
						ok = mid;
					} else {
						ng = mid;
					}
				}
				solve[i][j] = min(solve[i][j], ok);
				if(solve[i][j] != n) {
					ans[i][j] = max(ans[i][j], ans[i][j - 1] + 1);
				}
			}
		}
	}
	int anss = 0;
	for(int i = 0; i <= n; ++i) {
		for(int j = 0; j <= n; ++j) {
			anss = max(anss, ans[i][j]);
		}
	}
	cout << anss << '\n';
	return 0;
}