#include <bits/stdc++.h>
const int N = (int)1e3;
const int LEN = (int)2;
using namespace std;
int n, a[2][55], b[55];
int tt(int p) {
  int ans = 0;
  for (int i = 0; i < p; i++) {
    ans += a[0][i];
  }
  ans += b[p];
  for (int i = p; i < n; i++) {
    ans += a[1][i];
  }
  return ans;
}
int main() {
  cin >> n;
  for (int i = 0; i < 2; i++) {
    for (int j = 0; j < n - 1; j++) {
      cin >> a[i][j];
    }
  }
  for (int i = 0; i < n; i++) {
    cin >> b[i];
  }
  int ans1 = (int)1e8;
  int ans2 = (int)1e8;
  for (int i = 0; i < n; i++) {
    int cnt = tt(i);
    if (cnt < ans1) {
      ans2 = ans1;
      ans1 = cnt;
    } else if (cnt < ans2) {
      ans2 = cnt;
    }
  }
  cout << ans1 + ans2;
  return 0;
}
