

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

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());
		}

		Arrays.sort(a);

		if (n == 1) {
			System.out.println(0);
		} else {
			System.out.println(a[n - 1] - a[0]);
		}
	}

}
