import java.util.*;
import java.lang.*;
import java.io.*;

public class Main
{
	public static void main (String[] args) throws java.lang.Exception
	{
		Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
      int x = sc.nextInt();
      int[] arr = new int[n];
      int st = -1;
      int ed = -1;
      for(int i = 0 ; i < n ; i++){
        arr[i] = sc.nextInt();
          if(i-x >= 0 || i+x <= n-1) continue;
          if(st == -1) st = i;
          ed = i;
      }
      // st = 1 ed = 2
      // checking if non swap area is sorted or not
      st=Math.max(0,st);
      ed=Math.min(ed,n-1);
      for(int i = st ; i < ed -1 ; i++){
        if(arr[i] > arr[i+1]){
          System.out.println("NO");  // non swapping sorted or not
          return ;
        }
      }
      // non swap area either does not exist or it is sorted.

        System.out.println("YES");


	}
}