#include <bits/stdc++.h>
const int N = (int)1e6 + 123;
const long long linf = (long long)1e18 + 123;
const int inf = (int)1e9 + 123;
const double eps = 1e-6;
using namespace std;
void boost() {
  ios_base::sync_with_stdio(0);
  cin.tie(NULL);
  cout.tie(NULL);
}
int row1[55], row2[55], line[55];
int mn = inf;
int main() {
  boost();
  int n;
  cin >> n;
  for (int i = 1; i < n; i++) cin >> row1[i];
  for (int i = 1; i < n; i++) cin >> row2[i];
  for (int i = 1; i <= n; i++) cin >> line[i];
  for (int i = n; i >= 1; i--) {
    int ans = 0;
    for (int j = n - 1; j >= i; j--) {
      ans += row2[j];
    }
    ans += line[i];
    for (int j = i - 1; j >= 1; j--) {
      ans += row1[j];
    }
    mn = min(mn, ans);
  }
  int turn = 0;
  for (int i = n; i >= 1; i--) {
    int ans = 0;
    for (int j = n - 1; j >= i; j--) {
      ans += row2[j];
    }
    ans += line[i];
    for (int j = i - 1; j >= 1; j--) {
      ans += row1[j];
    }
    if (ans == mn) {
      turn = i;
      break;
    }
  }
  int mn1 = inf;
  for (int i = 1; i <= n; i++) {
    int ans = 0;
    if (i != turn) {
      for (int j = 1; j < i; j++) {
        ans += row1[j];
      }
      ans += line[i];
      for (int j = i; j < n; j++) {
        ans += row2[j];
      }
      mn1 = min(mn1, ans);
    }
  }
  cout << mn + mn1;
  return 0;
}
