

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		int n = sc.nextInt();

		int max = 0;
		int min = Integer.MAX_VALUE;

		for(int i = 0; i < n; i++){
			int tmp = sc.nextInt();

			max = Math.max(max, tmp);
			min = Math.min(min, tmp);
		}

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