#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  int n;
  cin >> n;
  vector<vector<int> > a(2, vector<int>(n + 1, 0));
  for (int i = 0; i < 2; i++)
    for (int j = 1; j <= n - 1; j++) cin >> a[i][j];
  vector<int> b(n);
  for (int i = 0; i < n; i++) cin >> b[i];
  for (int i = 1; i <= n - 1; i++) a[0][i] += a[0][i - 1];
  for (int i = n - 2; i >= 1; i--) a[1][i] += a[1][i + 1];
  vector<int> ans;
  for (int i = 0; i < n; i++) {
    int temp = 0;
    temp += b[i];
    temp += a[0][i];
    temp += a[1][i + 1];
    ans.push_back(temp);
  }
  sort(ans.begin(), ans.end());
  cout << ans[0] + ans[1] << endl;
}
