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(); 
		}
		int max = 0; int min = 1000;
		for (int i=0; i<N; i++) {
			if (max < a[i]) max = a[i];
			if (min > a[i]) min = a[i];
		}
		System.out.println(max-min);
	}
}
