import java.util.*; public class Main { public static void main(String[] args) throws Exception { Scanner koko = new Scanner(System.in); int n = koko.nextInt(); int k = koko.nextInt(); int[] p = new int[n]; for(int i=0; i<n; i++){ p[i] = koko.nextInt(); } Arrays.sort(p); System.out.println(p[n-1]-p[0]); } }