#include <bits/stdc++.h>
using namespace std;
long n, a[3][100], mid[100];
void readf() {
  cin >> n;
  for (int i = 1; i <= n - 1; i++) cin >> a[1][i];
  for (int i = 1; i <= n - 1; i++) cin >> a[2][i];
  for (int i = 1; i <= n; i++) cin >> mid[i];
}
void Solve() {
  long sum[100];
  for (int i = 1; i <= n; i++) {
    sum[i - 1] = mid[i];
    for (int j = 1; j <= i - 1; j++) sum[i - 1] += a[1][j];
    for (int j = i; j <= n; j++) sum[i - 1] += a[2][j];
  }
  sort(sum, sum + n);
  cout << sum[0] + sum[1];
}
int main() {
  readf();
  Solve();
  return 0;
}
