import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        int n;
        Scanner scan = new Scanner(System.in);
        n = scan.nextInt();
        int v[] = new int [n];
        for(int i = 0; i < n; i++)
            v[i] = scan.nextInt();
        int ans = -100000000;
        for(int a : v){
            for(int b:v){
                ans = Math.max(ans,Math.abs(a-b));
            }
        }
        System.out.println(ans);
    }
}

/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz