import java.util.*;
import java.io.*;

public class Main {
	public static void main (String[] args) throws Exception {
	    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		int n = Integer.parseInt(br.readLine());
		int[] arr = new int[n + 2];
		String[] line = br.readLine().split(" ", n);
		for (int i = 1; i <= n; i++) {
		    arr[i] = Integer.parseInt(line[i - 1]);
		}
		arr[0] = Integer.MIN_VALUE / 2;
		arr[n + 1] = Integer.MAX_VALUE / 2;
		Arrays.sort(arr);
		long total = 0;
		for (int i = 1; i <= n; i++) {
		    if (arr[i] - arr[i - 1] < arr[i + 1] - arr[i]) {
		        total += arr[i] - arr[i - 1];
		        arr[i] = arr[i - 1];
		    } else {
		        total += arr[i + 1] - arr[i];
		        arr[i] = arr[i + 1];
		    }
		}
		System.out.println(total);
    }
    
}