#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, i, j;
  cin >> n;
  vector<vector<int>> A(2, vector<int>(n - 1));
  for (auto& xs : A)
    for (int& x : xs) cin >> x;
  vector<int> B(n);
  for (i = 0; i < n && cin >> B[i]; ++i)
    for (j = 0; j < n - 1; ++j) B[i] += A[j >= i][j];
  sort(B.begin(), B.end());
  cout << B[0] + B[1] << '\n';
}
