import java.util.*;

public class Main{
	
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
  	int n=Integer.parseInt(sc.next());
    int[] a=new int[n];
    for(int i=0;i<n;i++){
      a[i]=Integer.parseInt(sc.next());
    }
    Array.sort(a);
    System.out.println(a[n-1]-a[0]);
  }
}
