import java.util.*;

public class Main {
	public static void main (String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int k = sc.nextInt();
		ArrayList<Integer> list = new ArrayList<>();
		list.add(0);
		list.add(Integer.MAX_VALUE);
		for (int i = 0; i < n; i++) {
		    int x = sc.nextInt();
		    if (x > 0) {
		        int idx = getIdx(list, x);
		        if (list.size() - idx - 1 < k) {
		            list.add(idx, x);
		        }
		    } else {
		        int idx = getIdx(list, -x);
		        if (list.get(idx) == -x) {
		            list.remove(idx);
		        }
		    }
 		}
 		System.out.println(list.size() - 2);
	}
	
	static int getIdx(ArrayList<Integer> list, int x) {
	    int left = 0;
	    int right = list.size();
	    while (right - left > 1) {
	        int m = (left + right) / 2;
	        if (list.get(m)>= x) {
	            right = m;
	        } else {
	            left = m;
	        }
	    }
	    return right;
	}
}