#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  int arr1[100];
  int arr2[100];
  int arr3[100];
  int solve[100];
  cin >> n;
  for (int i = 0; i < n - 1; i++) cin >> arr1[i];
  for (int i = 0; i < n - 1; i++) cin >> arr2[i];
  for (int i = 0; i < n; i++) cin >> arr3[i];
  int cnt = 0;
  for (int i = 0; i < n; i++) {
    int sum = 0;
    sum += arr3[i];
    for (int j = i; j < n - 1; j++) sum += arr2[j];
    for (int j = 0; j < i; j++) sum += arr1[j];
    solve[cnt++] = sum;
  }
  sort(solve, solve + cnt);
  cout << solve[0] + solve[1] << endl;
  return 0;
}
