#include <bits/stdc++.h>
using namespace std;
int A[52];
int B[52];
int C[52];
int main() {
  int n;
  cin >> n;
  for (int i = 0; i < n - 1; ++i) {
    cin >> A[i];
  }
  for (int i = 0; i < n - 1; ++i) {
    cin >> B[i];
  }
  for (int i = 0; i < n; ++i) {
    cin >> C[i];
  }
  int min1 = 70000;
  int min2 = 70000;
  int sum;
  int number;
  for (int g = 0; g < n; ++g) {
    sum = 0;
    for (int h = 0; h < n - g - 1; ++h) {
      sum = sum + A[h];
    }
    sum = sum + C[n - g - 1];
    for (int h = n - g - 1; h < n - 1; ++h) {
      sum = sum + B[h];
    }
    if (min1 == 70000 || min1 > sum) {
      min2 = min(min1, min2);
      min1 = min(min1, sum);
      number = g;
    }
    if (number != g) {
      min2 = min(min2, sum);
    }
  }
  cout << min1 + min2;
  return 0;
}
