#include <bits/stdc++.h>
using namespace std;
int main() {
  int i, n, row1[105], row2[105], bj[105];
  int m1 = 10000, m2 = 10000;
  int sum1 = 0, sum2 = 0, path;
  std::cin >> n;
  for (i = 0; i < n - 1; i++) cin >> row1[i];
  for (i = 0; i < n - 1; i++) cin >> row2[i];
  for (i = 0; i < n; i++) cin >> bj[i];
  for (i = 0; i < n - 1; i++) {
    sum2 += row2[i];
  }
  for (i = 0; i < n; i++) {
    path = sum1 + bj[i] + sum2;
    if (path < m1) {
      m2 = m1;
      m1 = path;
    } else if (path < m2)
      m2 = path;
    sum2 -= row2[i];
    sum1 += row1[i];
  }
  std::cout << m1 + m2;
  return 0;
}
