#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  int a[n - 1];
  int b[n - 1];
  int c[n];
  for (int i = 0; i < n - 1; i++) cin >> a[i];
  for (int i = 0; i < n - 1; i++) cin >> b[i];
  for (int i = 0; i < n; i++) cin >> c[i];
  int ans = 0;
  int sum1[n - 1];
  int sum2[n - 1];
  int j1[n];
  for (int i = 0; i < n - 1; i++) {
    sum1[i] = 0;
    sum2[i] = 0;
    j1[i] = 0;
  }
  j1[n - 1] = 0;
  int s = 0;
  for (int i = 0; i < n - 1; i++) {
    s += a[i];
    sum1[i] = s;
  }
  s = 0;
  for (int i = n - 2; i >= 0; i--) {
    s += b[i];
    sum2[i] = s;
  }
  int y = n - 1;
  j1[n - 1] = sum1[n - 2] + c[y];
  y--;
  for (int i = n - 2; i >= 1; i--) {
    j1[i] = sum2[i] + c[y] + sum1[i - 1];
    y--;
  }
  j1[0] = sum2[0] + c[0];
  sort(j1, j1 + n);
  cout << j1[0] + j1[1];
  return 0;
}
