#include <bits/stdc++.h>
using namespace std;
int arr[3][60], brr[60], dp[3][60], dp2[3][60];
vector<int> vrr;
int main() {
  ios_base::sync_with_stdio(0);
  long long n, s2, s1, i, j;
  cin >> n;
  s2 = 0;
  for (i = 1; i <= 2; i++) {
    for (j = 1; j < n; j++) {
      cin >> arr[i][j];
      if (i == 2) s2 += arr[i][j];
    }
  }
  for (i = 1; i <= n; i++) {
    cin >> brr[i];
  }
  s1 = 0;
  for (i = 1; i <= n; i++) {
    vrr.push_back(s1 + brr[i] + s2);
    s1 += arr[1][i];
    s2 -= arr[2][i];
  }
  sort(vrr.begin(), vrr.end());
  cout << vrr[0] + vrr[1];
  return 0;
}
