#include <bits/stdc++.h>
using namespace std;
long long second;
long long a1[1231], a2[2131];
long long b[1231];
long long sum[1231];
int main() {
  int n;
  cin >> n;
  for (int i = 2; i <= n; i++) cin >> a1[i];
  for (int i = 1; i <= n - 1; i++) cin >> a2[i];
  for (int i = 1; i <= n; i++) {
    cin >> b[i];
    second += a1[i];
    sum[i] = b[i] + second;
  }
  second = 0;
  for (int i = n; i >= 1; i--) {
    second += a2[i];
    sum[i] += second;
  }
  sort(sum, sum + n + 1);
  cout << sum[1] + sum[2];
}
