#include <bits/stdc++.h>
using namespace std;
vector<long long int> v;
long long int ar[3][110], b[110];
int main() {
  ios ::sync_with_stdio(0);
  cin.tie(NULL);
  long long int n, c = 0;
  cin >> n;
  ar[1][0] = ar[2][0] = 0;
  for (int i = 1; i <= 2; i++)
    for (int j = 1; j <= n - 1; j++) {
      cin >> ar[i][j];
      ar[i][j] += ar[i][j - 1];
    }
  for (int i = 1; i <= n; i++) cin >> b[i];
  for (int i = 1; i <= n; i++) {
    c = b[i];
    c += ar[2][n - 1] - ar[2][i - 1];
    c += ar[1][i - 1] - ar[1][0];
    v.push_back(c);
  }
  sort(v.begin(), v.end());
  cout << v[0] + v[1];
  return 0;
}
