#coding: utf-8
#yuki_059

n,k=map(int,raw_input().split())
bit=[0 for i in xrange(1000001)]
cnt=[0 for i in xrange(1000001)]

def sum(i):
 s=0
 while i>0:
  s+=bit[i]
  i-=i & (-i)
 return s
 
def add(i,x):
 while i<=1000000:
  bit[i]+=x
  i+=i & (-i)
  
total=0
for i in xrange(n):
 w=int(raw_input())
 if w>0:
  if total-sum(w-1)<k:
   add(w,1)
   cnt[w]+=1
   total+=1
 else:
  if cnt[-w]>0:
   add(-w,-1)
   cnt[-w]-=1
   total-=1
print total