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

int vv [111];
int ans [111];

int main()
{
    int n;
    cin >> n;
    for (int i = 0; i < n; i ++)
    {
        int a;
        cin >> a;
        vv[i] = a;
    }
    for (int i = 0; i < n - 1; i ++)
        for (int j = i + 1; j < n; j ++)
            if (vv[i] > vv[j])
                swap (vv[i], vv[j]);
    for (int i = n - 1; i >= 0; i --)
    {
        ans[i] = min(ans[i + 1], ans[i + 2]) + abs(vv[i + 1] - vv[i]);
    }
    cout << ans[0];
    return 0;
}