import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        try (Scanner sc = new Scanner(System.in);) {
            int n = sc.nextInt();
            int min = Integer.MAX_VALUE;
            int max = 0;
            for (int i = 0; i < n; i++) {
                int a = sc.nextInt();
                min = Math.min(min, a);
                max = Math.max(max, a);
            }
            System.out.println(max - min);
        }
    }
}
