/*
TASK:ots
LANG:C++
*/
#include <iostream>
using namespace std;
int main()
{
    int n,i,a[1000000],e=0;
    cin >> n;
    for (i=0;i<n;i++)
        cin >> a[i];
    sort(a,a+n);
    for (i=1;i<n-1;i++)
        e+=min(a[i]-a[i-1],a[i+1]-a[i]);
    cout << e << '\n';
    return 0;
}
