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 = sc.nextInt();
		int[]a = new int[N];
		for(int i = 0; i < N; i++) {
			a[i] = sc.nextInt();
		}
		sc.close();
		Arrays.sort(a);
		int l = 0;
		for(int i = 1; i < N; i++) {
			l += a[i] - a[i - 1];
		}
		System.out.println(l);
	}
}