import java.util.*;
import java.io.*;

public class Main{
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int[] arr = new int[n];

		for(int i=0; i<n; i++){
			arr[i] = sc.nextInt();
		}
		
		int min = arr[0];
		int max = arr[0];

		for(int i=1; i<n; i++){
			if(arr[i] < min)
				min = arr[i];
			if(arr[i] > max)
				max = arr[i];
		}

		System.out.println(max-min);
	}
}
