#include <bits/stdc++.h>
using namespace std;
const int oo = 0x7fffffff;
int a[60], b[60], c[60];
int sum1[60], sum2[60];
int main() {
  int n;
  scanf("%d", &n);
  for (int i = 2; i <= n; i++) {
    scanf("%d", &a[i]);
    sum1[i] = sum1[i - 1] + a[i];
  }
  for (int i = 1; i < n; i++) scanf("%d", &b[i]);
  for (int i = n - 1; i > 0; i--) sum2[i] = sum2[i + 1] + b[i];
  for (int i = 1; i <= n; i++) scanf("%d", &c[i]);
  int mn = oo, mn1 = oo;
  for (int i = 1; i <= n; i++)
    if (sum1[i] + sum2[i] + c[i] <= mn) {
      mn1 = mn;
      mn = sum1[i] + sum2[i] + c[i];
    } else if (sum1[i] + sum2[i] + c[i] <= mn1)
      mn1 = sum1[i] + sum2[i] + c[i];
  printf("%d\n", mn + mn1);
  return 0;
}
