import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int min = Integer.MAX_VALUE;
        int max = Integer.MIN_VALUE;

        for (int i = 0; i < n; i++) {
            int num = sc.nextInt();
            min = Math.min(min, num);
            max = Math.max(max, num);
        }

        sc.close();

        System.out.println(max - min);
    }
}