#include <bits/stdc++.h>
using namespace std;
int cost[2][55];
int a[2][55], b[55];
int main() {
  int n;
  cin >> n;
  for (int i = 0; i < 2; i++) {
    for (int j = 1; j < n; j++) {
      cin >> a[i][j + (1 - i)];
    }
  }
  for (int i = 1; i <= n; i++) {
    cin >> b[i];
  }
  for (int i = 2; i <= n; i++) {
    cost[0][i] = cost[0][i - 1] + a[0][i];
  }
  for (int i = n - 1; i >= 1; i--) {
    cost[1][i] = cost[1][i + 1] + a[1][i];
  }
  int first = 1 << 30, second = 1 << 30;
  for (int i = 1; i <= n; i++) {
    int t = cost[0][i] + cost[1][i] + b[i];
    second = min(second, t);
    if (second < first) {
      swap(first, second);
    }
  }
  cout << first + second << endl;
}
