#include <bits/stdc++.h>
using namespace std;
int main() {
  int N;
  int a[107], b[107], c[107];
  cin >> N;
  for (int i = 0; i < N - 1; i++) cin >> c[i];
  for (int i = 0; i < N - 1; i++) cin >> a[i];
  for (int i = 0; i < N; i++) cin >> b[i];
  int ac[107];
  int Q = 0;
  for (int i = 0; i < N - 1; i++) Q += a[i];
  int S = 0;
  for (int i = 0, j = 0; i < N; i++, j++) {
    ac[i] = b[i] + S + Q;
    if (j != N - 1) {
      S += c[j];
      Q -= a[j];
    } else
      break;
  }
  for (int i = 0; i < N; i++)
    for (int j = i + 1; j < N; j++)
      if (ac[i] > ac[j]) {
        int t = ac[i];
        ac[i] = ac[j];
        ac[j] = t;
      }
  cout << ac[0] + ac[1];
  return 0;
}
