#include <bits/stdc++.h>
using namespace std;
int a[3][55];
int b[55];
int length[55];
int sum1[55];
int sum2[55];
int sum3[55];
int main() {
  int n;
  int i, j, k;
  while (~scanf("%d", &n)) {
    for (i = 1; i <= 2; i++) {
      for (j = 1; j < n; j++) scanf("%d", &a[i][j]);
    }
    for (i = 1; i <= n; i++) scanf("%d", &b[i]);
    if (n == 2) {
      printf("%d\n", b[1] + a[1][1] + a[2][1] + b[2]);
      continue;
    }
    for (i = 2; i <= n; i++) sum1[i] = sum1[i - 1] + a[1][i - 1];
    for (i = n - 1; i >= 1; i--) sum2[i] = sum2[i + 1] + a[2][i];
    for (i = 1; i <= n; i++) sum3[i] = sum1[i] + sum2[i] + b[i];
    sort(sum3, sum3 + n + 1);
    printf("%d\n", sum3[1] + sum3[2]);
  }
  return 0;
}
