#include <bits/stdc++.h>
using namespace std;
const double eps = 1e-7;
int n;
int a[60], b[60], c[60], res[60];
int main() {
  scanf("%d", &n);
  for (int i = 1; i < n; ++i) scanf("%d", a + i);
  for (int i = 0; i < n - 1; ++i) scanf("%d", b + i);
  for (int i = 0; i < n; ++i) scanf("%d", c + i);
  a[0] = 0;
  for (int i = 1; i < n; ++i) a[i] += a[i - 1];
  b[n - 1] = 0;
  for (int i = n - 2; i >= 0; --i) b[i] += b[i + 1];
  for (int i = 0; i < n; ++i) {
    res[i] = a[i] + b[i] + c[i];
  }
  sort(res, res + n);
  printf("%d\n", res[0] + res[1]);
}
