import java.util.*;


public class Main {
    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int min = 1000;
        int max = 1;
        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);
    }
}