content: import java.io.*;
  import java.util.*;
  import java.text.*;
  import java.math.*;
  import java.util.regex.*;
  
  
  class Difference {
    	private int[] elements;
    	public int maximumDifference;
  
      Difference(int[] elements) {
          this.elements = elements;
      }
  
      public void computeDifference() {
          int max = 0;
          for (int i = 0; i < elements.length; i++) {
              for (int j = 0; j < elements.length; j++) {
                  int abs = Math.abs(elements[i] - elements[j]);
                  if (abs > max) max = abs;
              }
          }
          maximumDifference = max;
      }
  
  } // End of Difference class
  
  public class Solution {
  
      public static void main(String[] args) {
          Scanner sc = new Scanner(System.in);
          int n = sc.nextInt();
          int[] a = new int[n];
          for (int i = 0; i < n; i++) {
              a[i] = sc.nextInt();
          }
          sc.close();
  
          Difference difference = new Difference(a);
  
          difference.computeDifference();
  
          System.out.print(difference.maximumDifference);
      }
  }