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]);
 }
}