#include <bits/stdc++.h>
using namespace std;
int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n, i, j, k, ans, x;
  cin >> n;
  vector<int> a0(n - 1), a1(n - 1), s0(n), s1(n), b(n);
  for (i = 0; i < n - 1; i++) cin >> a0[i];
  for (i = 0; i < n - 1; i++) cin >> a1[i];
  for (i = 0; i < n; i++) cin >> b[i];
  s0[0] = 0;
  for (i = 0; i < n - 1; i++) s0[i + 1] = s0[i] + a0[i];
  s1[0] = 0;
  for (i = 0; i < n - 1; i++) s1[i + 1] = s1[i] + a1[i];
  ans = 1E9;
  for (i = 0; i < n; i++) {
    for (j = i + 1; j < n; j++) {
      x = s0[i] + s0[j] + s1[n - 1] - s1[i] + s1[n - 1] - s1[j] + b[i] + b[j];
      ans = min(ans, x);
    }
  }
  cout << ans << "\n";
  return 0;
}
