#include <bits/stdc++.h>
using namespace std;
int main() {
  cin.tie(NULL);
  ios::sync_with_stdio(false);
  int n;
  cin >> n;
  int a1[n - 1], a2[n - 1], b[n], i;
  int ac1[n], ac2[n], s = 0;
  ac1[0] = 0;
  for (i = 0; i < n - 1; i++) {
    cin >> a1[i];
    ac1[i + 1] = a1[i] + ac1[i];
  }
  for (i = n - 2; i >= 0; i--) cin >> a2[i];
  ac2[0] = 0;
  for (i = 1; i < n; i++) ac2[i] = ac2[i - 1] + a2[i - 1];
  for (i = 0; i < n; i++) cin >> b[i];
  int val[n];
  for (i = 0; i < n; i++) val[i] = ac1[i] + b[i] + ac2[n - 1 - i];
  int min = 99999, p1, p2;
  for (i = 0; i < n; i++)
    if (min >= val[i]) {
      min = val[i];
      p1 = i;
    }
  min = 99999;
  for (i = 0; i < n; i++)
    if (i != p1 && min >= val[i]) {
      min = val[i];
      p2 = i;
    }
  cout << val[p1] + val[p2] << endl;
}
