#include <bits/stdc++.h>
using namespace std;
struct __s {
  __s() {
    if (1) {
      ios_base::Init i;
      cin.sync_with_stdio(0);
      cin.tie(0);
    }
  }
  ~__s() {
    if (!1)
      fprintf(stderr, "Execution time: %.3lf s.\n",
              (double)clock() / CLOCKS_PER_SEC);
    long long n;
    cin >> n;
  }
} __S;
long long a[55][2];
int main(void) {
  long long n;
  cin >> n;
  for (long long j = 0; j < (long long)(2); j++) {
    for (long long i = 0; i < (long long)(n - 1); i++) {
      cin >> a[i + !j][j];
    }
  }
  long long b[55];
  for (long long i = 0; i < (long long)(n); i++) {
    cin >> b[i];
  }
  for (long long i = 1; i < n; i++) {
    a[i][0] += a[i - 1][0];
  }
  for (long long i = n - 2; i >= 0; i--) {
    a[i][1] += a[i + 1][1];
  }
  long long ans = 1e9;
  for (long long i = 0; i < (long long)(n); i++) {
    for (long long j = 0; j < (long long)(n); j++) {
      if (i == j) continue;
      long long res = 0;
      res += a[i][0] + a[j][0];
      res += a[i][1] + a[j][1];
      res += b[i] + b[j];
      ans = min(res, ans);
    }
  }
  cout << ans << '\n';
  return 0;
}
