#include <bits/stdc++.h>
using namespace std;
int ans[1000], b[1000], suma[1000], sumb[1000];
int main() {
  int i, n, d;
  cin >> n;
  for (i = 1; i < n; i++) {
    cin >> d;
    if (i == 0)
      suma[i] = d;
    else
      suma[i] = suma[i - 1] + d;
  }
  for (i = 1; i < n; i++) {
    cin >> d;
    if (i == 0)
      sumb[i] = d;
    else
      sumb[i] = sumb[i - 1] + d;
  }
  for (i = 0; i < n; i++) cin >> b[i];
  for (i = 0; i < n; i++)
    ans[i] = suma[i] - suma[0] + sumb[n - 1] - sumb[i] + b[i];
  sort(ans, ans + n);
  cout << ans[0] + ans[1];
  return 0;
}
