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

public class Main {

	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int N = scan.nextInt();
		int[] a = new int[N];
		for(int i = 0; i < N; i++) {
			a[i] = scan.nextInt();
		}
		Arrays.sort(a);
		System.out.println(a[a.length - 1] - a[0]);
		scan.close();

	}

}
