#include <bits/stdc++.h>
using namespace std;

int main() {
  ios::sync_with_stdio(false);

  int N; { cin >> N; }

  vector<int> Y(N); {
    for (int i = 0; i < N; ++i) cin >> Y[i];
    sort(Y.begin(), Y.end());
  }

  vector<int64_t> d(N + 1, (int64_t) 1 << 60); {
    d[0] = 0;
    for (int i = 0; i < N; ++i) {
      if (i + 2 <= N) d[i + 2] = min(d[i + 2], d[i] + Y[i + 1] - Y[i]);
      if (i) d[i + 1] = min(d[i + 1], d[i] + Y[i] - Y[i - 1]);
    }
  }

  cout << d[N] << endl;
}