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