#include <bits/stdc++.h>
using namespace std;
int a[20], b[20], c[20];
int main() {
  int n;
  cin >> n;
  for (int i = 0; i < (n); ++i) cin >> a[i];
  int sum = 0;
  for (int i = 0; i < (n); ++i) {
    cin >> b[i];
    sum += b[i];
  }
  int csum = 0;
  for (int i = 0; i < ((n - 1)); ++i) {
    cin >> c[i];
    csum += c[i];
  }
  if (n == 2) {
    cout << sum + csum << endl;
  } else {
    if (n >= 4) cout << sum + csum - c[0] << endl;
    if (n < 4) cout << sum + csum - c[1] << endl;
  }
  return 0;
}
