import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class No00000021_Main {

	public static void main(String[] args) {

		Scanner scan = new Scanner(System.in);

		int n = scan.nextInt();
		scan.nextLine();

		scan.nextLine();
		List<Integer> arr = new ArrayList<Integer>();
		for(int i = 0; i < n; i++) {
			arr.add(Integer.parseInt(scan.nextLine()));
		}

		int max = arr.get(0);
		int min = arr.get(0);
		for(int num : arr) {
			if(max < num) {
				max = num;
			} else if(num < min) {
				min = num;
			}
		}

		System.out.println(max - min);

		scan.close();

	}

}