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]);
  }
  

  
}