#include <bits/stdc++.h>
using namespace std;
int n;
int a[105][2], b[104];
int distL[105], distR[105];
int dist[105];
int main() {
  ios::sync_with_stdio(0);
  ;
  cin >> n;
  for (int i = 1; i < n; i++) {
    cin >> a[i][0];
  }
  for (int i = 1; i < n; i++) {
    cin >> a[i][1];
  }
  for (int i = 1; i <= n; i++) {
    cin >> b[i];
  }
  for (int i = 1; i < n; i++) {
    distL[i] = distL[i - 1] + a[i][0];
  }
  for (int i = n - 1; i > 0; i--) {
    distR[i] = distR[i + 1] + a[i][1];
  }
  int mini1((1 << 27)), mini2((1 << 27));
  int k = 0;
  for (int i = 1; i <= n; i++) {
    k = b[i] + distL[i - 1] + distR[i];
    if (k <= mini2) {
      if (k <= mini1) {
        mini2 = mini1;
        mini1 = k;
      } else {
        mini2 = k;
      }
    }
  }
  cout << mini1 + mini2 << "\n";
  return 0;
};
