F

#define _CRT_SECURE_NO_DEPRECATE

#include <iostream>
#include <vector>
#include <string>
#include <map>
#include <set>
#include <algorithm>

#define ull unsigned long long
#define ll long long

using namespace std;

const int N = 101;
const ll INF = 1000ll * 1000 * 1000 * 1000 * 1000 * 1000ll;

ll a[N];
ll d[N];


int main() {
	//freopen("input.txt", "r", stdin);
	//freopen("output.txt", "w", stdout);
	int n;
	cin >> n;
	for (int i = 1; i <= n; i++) {
		cin >> a[i];
		d[i] = 0;
	}
	sort(a, a + n);
	d[0] = 0ll;
	d[1] = INF;
	for (int i = 2; i <= n; i++) {
		d[i]  = min(d[i - 1], d[i - 2]) + abs(a[i - 1] - a[i - 2]);
	}
	cout << d[n];


	return 0;
}