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

public class Main {
	public static void main(String[]args){
		
		Scanner scan = new Scanner(System.in);
		
		
		int N = scan.nextInt();
		
		int[] a = new int[N];
		
		for(int i = 0;i<N;i++){
			
			a[i] = scan.nextInt();
			
		}
		
		
		Arrays.sort(a);
		
		
		System.out.println(a[N-1]-a[0]);
		
		
		
		
		
		
		
		
		
	}

}
