#include <bits/stdc++.h>
using namespace ::std;
int main() {
  int n, i = 0, j = 0, m = 0, k = 0, a[105][2], b[105], y = 0, c[101];
  cin >> n;
  for (j = 0; j < 2; j++) {
    for (i = 1; i < n; i++) cin >> a[i][j];
  }
  for (i = 1; i <= n; i++) {
    cin >> b[i];
  }
  for (i = 1; i <= n; i++) {
    m = b[i];
    for (j = 1; j < n; j++) {
      if (j == i) {
        k++;
        m = m + a[j][k];
        continue;
      }
      m = m + a[j][k];
    }
    k = 0;
    c[y] = m;
    y++;
  }
  for (i = 1; i < y; i++) {
    for (j = 0; j < y - 1; j++)
      if (c[i] <= c[j]) {
        n = c[j];
        c[j] = c[i];
        c[i] = n;
      }
  }
  m = c[0] + c[1];
  cout << m;
}
