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