import java.util.*;

public class Main{
    public static void main(String args[] ) throws Exception {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int min = 1000;
        int max = 0;
        for (int i = 0; i < n; i++) {
            int a = sc.nextInt();
            if (a < min) {
                min = a;
            }
            if (a > max) {
                max = a;
            }
        }
        System.out.println(max - min);
    }
}
