#include <bits/stdc++.h>
using namespace std;
int main() {
  long int a, b, c, d, e = 0, f[50], g[50], h[50][50], k[50];
  k[0] = 0;
  cin >> a;
  f[1] = 0;
  g[a] = 0;
  for (int i = 2; i <= a; i++) cin >> f[i];
  for (int i = 1; i <= a - 1; i++) cin >> g[i];
  for (int i = 1; i <= a; i++) cin >> h[i][i];
  int i = 1, n;
  for (int j = 1; j <= a; j++) {
    n = j;
    for (int i = 1; i <= j; i++) e = f[i] + e;
    e += h[j][j];
    for (int m = 1; m <= a - j; m++) e = e + g[n++];
    k[j] = e;
    e = 0;
  }
  for (i = 1; i <= a; i++) {
    for (int j = 1; j <= a - i; j++)
      if (k[j] > k[j + 1]) {
        c = k[j];
        k[j] = k[j + 1];
        k[j + 1] = c;
      }
  }
  i = 1;
  cout << k[i] + k[i + 1];
  return 0;
}
