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

public class Main {

	@SuppressWarnings("resource")
	public static void main(String args[]) {
		Scanner scanner = new Scanner(System.in);
		int n = scanner.nextInt();
		int a[] = new int[n];

		for (int i = 0; i < n; i++) {
			a[i] = scanner.nextInt();
		}

		Arrays.sort(a);

		System.out.println(a[a.length - 1] - a[0]);
	}
}
