#include <bits/stdc++.h>
using namespace std;
int main() {
  int x, n, r1[55] = {0}, r2[55] = {0}, cr[55] = {0}, second[105], l = 0;
  cin >> n;
  for (int i = 1; i <= n - 1; i++) {
    cin >> x;
    r1[i] = r1[i - 1] + x;
  }
  for (int i = 1; i <= n - 1; i++) {
    cin >> r2[i];
  }
  for (int i = 1; i <= n; i++) {
    cin >> cr[i];
  }
  r2[n] = 0;
  for (int i = n - 1; i >= 1; i--) {
    r2[i] = r2[i + 1] + r2[i];
  }
  for (int i = n - 1; i >= 1; i--) {
    second[l++] = r2[i] + cr[i] + (i > 1) * r1[i - 1];
  }
  second[l++] = cr[n] + r1[n - 1];
  sort(second, second + l);
  cout << second[0] + second[1] << '\n';
  return 0;
}
