#include <bits/stdc++.h>
using namespace std;
const int inf = 1e9 + 7;
const int maxn = 1e6 + 10;
int a[100][100], b[100];
int sum[100][100];
int main() {
  cin.sync_with_stdio(false);
  int n;
  cin >> n;
  for (int i = 0; i <= 1; i++) {
    for (int j = 1; j < n; j++) cin >> a[i][j];
  }
  for (int i = 1; i <= n; i++) cin >> b[i];
  for (int i = 0; i < 2; i++) {
    for (int j = 1; j < n; j++) sum[i][j] = sum[i][j - 1] + a[i][j];
  }
  int ans = inf;
  for (int i = 1; i < n; i++) {
    for (int j = i + 1; j <= n; j++) {
      int tot = b[i] + b[j] + sum[0][i - 1] + sum[0][j - 1] + sum[1][n - 1] -
                sum[1][i - 1] + sum[1][n - 1] - sum[1][j - 1];
      ans = min(ans, tot);
    }
  }
  cout << ans << endl;
}
