class BIT:
    def __init__(self, n):
        self.size = n
        self.tree = [0]*(n+1)
 
    def build(self, list):
        self.tree[1:] = list.copy()
        for i in range(self.size+1):
            j = i + (i & (-i))
            if j < self.size+1:
                self.tree[j] += self.tree[i]

    def sum(self, i):
        # [0, i) の要素の総和を返す
        s = 0
        while i>0:
            s += self.tree[i]
            i -= i & -i
        return s
    # 0 index を 1 index に変更  転倒数を求めるなら1を足していく
    def add(self, i, x):
        i += 1
        while i <= self.size:
            self.tree[i] += x
            i += i & -i



n,k = map(int,input().split())
bit = BIT(10**6+5)
dic = {}
s = 0
for i in range(n):
    w = int(input())
    if w >= 0:
        if s - bit.sum(w) >= k:
            continue
        bit.add(w,1)
        s += 1
        dic[w] = dic.get(w,0)+1
    else:
        w *= -1
        if dic.get(w,0) > 0:
            bit.add(w,-1)
            dic[w] -= 1
            s -= 1
print(bit.sum(10**6+5))