#include <bits/stdc++.h>
using namespace std;
int a[1000000], b[1000000], c[1000000], aa[1000000], bb[1000000];
int main() {
  int n, i;
  cin >> n;
  a[1] = 0;
  for (i = 2; i <= n; i++) cin >> a[i];
  b[i] = 0;
  for (i = 2; i <= n; i++) cin >> b[i];
  for (i = 1; i <= n; i++) cin >> c[i];
  int j, k, p, h, g, s, mini = INT_MAX;
  aa[0] = 0;
  aa[1] = 0;
  for (i = 2; i <= n; i++) aa[i] = aa[i - 1] + a[i];
  bb[0] = 0;
  bb[1] = 0;
  for (i = 2; i <= n; i++) bb[i] = bb[i - 1] + b[i];
  for (g = 1; g <= n; g++) {
    s = 0;
    for (i = 1; i <= n; i++) {
      if (i != g) {
        s = aa[g] + c[g] + (bb[n] - bb[g]) + aa[i] + c[i] + (bb[n] - bb[i]);
        if (s < mini) mini = s;
      }
    }
  }
  cout << mini << endl;
  return 0;
}
