import java.util.Scanner;
 
public class Main {
	  public static void main(String args[]) {
		    Scanner scanner = new Scanner(System.in);
 
 
		    String str1 = scanner.next();
		    int N = Integer.parseInt(str1);
		    int[] array = new int[N];
		    String str2 = scanner.next();
                    int  M =Integer.parseInt(str2);
                    array[0] = M;
		    int maximum = array[0];
		    int minimum = array[0];
		    
		    for(int i = 1; i<array.length; i++)
		    {
		    	array[i] = scanner.nextInt();
		    	int v = array[i];
		    	if(v > maximum)
		    	{
		    		maximum = v;
		    	}
		    	if(v < minimum)
		    	{
		    		minimum = v;
		    	}
		    }
		    
		    int Delta = maximum - minimum ;
		    System.out.println(Delta);
		    
        	scanner.close();}
		  }
/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