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