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