using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Text;
using System.Text.RegularExpressions;
using System.Linq;
using System.IO;

class Program
{
    static void Main()
    {
        new Magatro().Solve();
    }
}

class Magatro
{
    private int N, K;
    private int[] W;
    private void Scan()
    {
        var line = Console.ReadLine().Split(' ');
        N = int.Parse(line[0]);
        K = int.Parse(line[1]);
        W = new int[N];
        for (int i = 0; i < N; i++)
        {
            W[i] = int.Parse(Console.ReadLine());
        }
    }

    public void Solve()
    {
        Scan();
        var segtree = new SegmentTree(100001);
        foreach (int i in W)
        {
            if (i > 0)
            {
                if (segtree.Query(i, 100001) < K)
                {
                    segtree.Update(i, segtree.Tree[i] + 1);
                }
            }
            else
            {
                int j = -i;
                segtree.Update(j, Math.Max(0, segtree.Tree[j] - 1));
            }
        }
        Console.WriteLine(segtree.Tree[0]);
    }
}

class SegmentTree
{
    private int N;
    public int[] Tree;

    public SegmentTree(int length)
    {
        for (N = 1; N <= length; N *= 2) ;
        Tree = (new int[2 * N - 1]);
    }
    /// <summary>
    /// index(0_indexed)をvに更新
    /// </summary>
    /// <param name="index"></param>
    /// <param name="v"></param>
    public void Update(int index, int v)
    {
        int i = index + N - 1;
        Tree[i] = v;
        while (i > 0)
        {
            i = (i - 1) / 2;
            Tree[i] = Tree[i * 2 + 1] + Tree[i * 2 + 2];
        }
    }
    public int Query(int left, int right)
    {
        return Query(left, right, 0, 0, N);
    }

    private int Query(int a, int b, int k, int l, int r)
    {
        if (r <= a || b <= l) return 0;
        if (a <= l && r <= b)
        {
            return Tree[k];
        }
        else
        {
            int vl = Query(a, b, k * 2 + 1, l, (l + r) / 2);
            int vr = Query(a, b, k * 2 + 2, (l + r) / 2, r);
            return vl + vr; ;
        }
    }
}