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;
    for (int i=0; i<N; i++) {
      A[i] = sc.nextInt();
    }
    for (int i=0; i<N; i++) {
      for (int j=i+1; j<N; j++) {
        max = Math.max(Math.abs(A[i]-A[j]),max);
      }
    }                                  
    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