#include <bits/stdc++.h>
using namespace std;
int n, a[3][55], b[55];
int sum(int row, int f, int e) {
  int res = 0;
  for (int i = f; i <= e; ++i) res += a[row][i];
  return res;
}
int main() {
  cin >> n;
  for (int x = 1; x <= 2; ++x)
    for (int i = 1; i < n; ++i) cin >> a[x][i];
  for (int i = 1; i <= n; ++i) cin >> b[i];
  int ans = (1 << 30);
  for (int i = 1; i < n; ++i)
    for (int j = i + 1; j <= n; ++j)
      ans = min(ans, sum(1, 1, i - 1) + sum(2, i, n - 1) + b[i] +
                         sum(1, 1, j - 1) + sum(2, j, n - 1) + b[j]);
  cout << ans;
}
