#include <bits/stdc++.h>
using namespace std;
int n, a[128], b[128], c[128], dp[128];
int main() {
  cin >> n;
  for (int i = 1; i < n; i++) {
    cin >> a[i];
    a[i] += a[i - 1];
  }
  for (int j = 1; j < n; j++) cin >> b[j];
  for (int i = n; i >= 1; i--) b[i] += b[i + 1];
  for (int i = 1; i <= n; i++) cin >> c[i];
  for (int i = 1; i <= n; i++) dp[i] = a[i - 1] + b[i] + c[i];
  sort(dp + 1, dp + 1 + n);
  cout << dp[1] + dp[2] << endl;
  return 0;
}
