import java.util.*;
public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int[] a = new int[n];
        int max = 0;
        int sabun = 0;

        for(int i =0;i<n;i++){
            a[i] = sc.nextInt();
        }

        for(int i = 0;i<n-1;i++){
            for(int j = i+1;j<n;j++){
                sabun = Math.abs(a[i]-a[j]);
                if(max<sabun){
                    max = sabun;
                }
            }
        }
        System.out.println(max);

    }
}

/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