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package HackerRank;

import java.util.*;

public class Nineteen {

public static void main(String[] args) {

Scanner in = new Scanner(System.in);

int n = in.nextInt(); // number of integers

int m = in.nextInt(); // size of subarray

Deque<Integer> deque = new ArrayDeque<Integer>();

Map<Integer, Integer> freqMap = new HashMap<Integer, Integer>();

int maxUnique = 0;

for (int i = 0; i < n; i++) {

int num = in.nextInt();

deque.addLast(num);

if (freqMap.containsKey(num)) {

freqMap.put(num, freqMap.get(num) + 1);

} else {

freqMap.put(num, 1);

}

if (deque.size() == m) {

maxUnique = Math.max(maxUnique, freqMap.size());

int removed = deque.removeFirst();

int count = freqMap.get(removed);

if (count == 1) {

freqMap.remove(removed);

} else {

freqMap.put(removed, count - 1);

}

}

}

System.out.println(maxUnique);

}

}