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]);
  }
}

/*
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
String blank = sc.nextLine();
String s = sc.nextLine();
System.out.println();
System.exit(0)
*/
