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];
      
      for(int i=0;i<n;i++){
      	a[i] = sc.nextInt();
      }
      
      Arrays.sort(a);
      
    System.out.println(a[n-1] -  a[0]);
      
}
}

/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