/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
public class Main
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
		int[] arr = {1, 1, 3, 1, 2, 3};
		int k = 2;
		if(findArrayDistance(arr,k)){
			System.out.println("yes");
		}else{
			System.out.println("no");
		}
	}
	public static boolean findArrayDistance(int[] arr, int k){
		HashMap<Integer,Integer> map = new HashMap<>();
		for(int i=0;i<arr.length;i++){
			if(map.containsKey(arr[i]) && (i - map.get(arr[i])) <= k){
				return true;
			}
			map.put(arr[i],i);
		}
		return false;
	}
}

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