#include <bits/stdc++.h>
using namespace std;
int l[123], r[123];
int d[123];
int main() {
  ios_base::sync_with_stdio(false);
  int n;
  cin >> n;
  l[0] = 0;
  for (int i = 1; i < n; ++i) {
    int x;
    cin >> x;
    l[i] = l[i - 1] + x;
  }
  r[n - 1] = 0;
  vector<int> a;
  for (int i = 0; i < (int)n - 1; ++i) {
    int x;
    cin >> x;
    a.push_back(x);
  }
  int k = n - 2;
  for (int i = n - 2; i >= 0; --i) {
    r[i] = r[i + 1] + a[k];
    k--;
  }
  for (int i = 0; i < (int)n; ++i) cin >> d[i];
  int res[123];
  for (int i = 0; i < (int)n; ++i) res[i] = d[i] + l[i] + r[i];
  sort(res, res + n);
  cout << res[0] + res[1];
  return 0;
}
