#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  int A1[50], B[50], A2[50];
  A1[0] = A2[0] = 0;
  for (int(i) = 0; (i) < (n); (i)++) {
    if (i != 0) {
      cin >> A1[i];
      A1[i] += A1[i - 1];
    }
  }
  for (int(i) = 0; (i) < (n); (i)++) {
    if (i != 0) {
      cin >> A2[i];
      A2[i] += A2[i - 1];
    }
  }
  for (int(i) = 0; (i) < (n); (i)++) cin >> B[i];
  int ans1 = 100000, ans2 = 100000;
  int ii = -1;
  for (int(i) = 0; (i) < (n); (i)++) {
    if (ans1 > A1[i] + B[i] + (A2[n - 1] - A2[i])) {
      ans1 = A1[i] + B[i] + (A2[n - 1] - A2[i]);
      ii = i;
    }
  }
  B[ii] = 100000;
  for (int(i) = 0; (i) < (n); (i)++) {
    if (ans2 > A1[i] + B[i] + (A2[n - 1] - A2[i])) {
      ans2 = A1[i] + B[i] + (A2[n - 1] - A2[i]);
      ii = i;
    }
  }
  cout << ans1 + ans2 << endl;
  return 0;
}
