#include <bits/stdc++.h>

#define _debugVar(x) { cerr << ">> " <<#x << " = " << x << endl; }

using namespace std;
using LL = long long;

const int N = 1005, M = 10005;
constexpr int INF = 0x3f3f3f3f;

int n;
int f[N][M]; // f[i][j] 第 i 本书, B 第 j 分钟读完, A 花的最小时间 
int a[N], b[N];

int main()
{
	// freopen("1.in", "r", stdin);
	ios::sync_with_stdio(false);
	cin.tie(nullptr);

	cin >> n;
	for(int i = 1; i <= n; i++) 
		cin >> a[i];
	for(int i = 1; i <= n; i++) 
		cin >> b[i];

	memset(f, 0x3f, sizeof f);
	f[1][b[1]] = b[1]+a[1];

	int m = n*10;
	for(int i = 2; i <= n; i++) {
		for(int j = b[i]; j <= m; j++) {
			if(f[i-1][j-b[i]] <= j) {
				f[i][j] = min(f[i][j], j+a[i]);
			} else {
				f[i][j] = min(f[i][j], f[i-1][j-b[i]]+a[i]);
			}
			if(i >= 2) {
				if(f[i-2][j-b[i]]+a[i-1] <= j) {
					f[i][j] = min(f[i][j], j+a[i]);
				} else {
					f[i][j] = min(f[i][j], f[i-2][j-b[i]]+a[i]+a[i-1]);
				}
			}
		}
	}

	int ans = INF;
	for(int i = 1; i <= m; i++) 
		ans = min(ans, f[n][i]);
	cout << ans << endl;
	return 0;
}