import java.util.Arrays;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner in=new Scanner(System.in);
		int n;
		n=in.nextInt();
		int [] a = new int[n];
		for(int i=0;i<n;i++)
		{
			a[i]=in.nextInt();
		}
		Arrays.sort(a);
		int sum=0;
		for(int i=0;i<n-1;i++)
		{
			sum+=a[i+1]-a[i];
		}
		System.out.println(sum);
   
	}

	

	

}