#include <bits/stdc++.h>
using namespace std;
int arr[1000009];
int a[100007];
int b[100007];
int c[100007];
int main() {
  int n, t = 1000000009;
  cin >> n;
  for (int i = 1; i < n; i++) {
    cin >> a[i];
    a[i] = a[i] + a[i - 1];
  }
  for (int i = 1; i < n; i++) {
    cin >> b[i];
    b[i] = b[i] + b[i - 1];
  }
  for (int i = 0; i < n; i++) {
    cin >> c[i];
  }
  t = min(t, a[n - 1] + c[n - 1]);
  vector<int> v;
  v.push_back(t);
  for (int i = 1; i < n - 1; i++) {
    v.push_back(a[i] + c[i] + (b[n - 1] - b[i]));
  }
  v.push_back(b[n - 1] + c[0]);
  sort(v.begin(), v.end());
  cout << v[0] + v[1] << endl;
  return 0;
}
