N, K = map(int, raw_input().split())
nimotsu = {}
for _ in xrange(N):
    query = int(raw_input())
    if query > 0:
        if sum(v for k,v in nimotsu.items() if k >= query) < K:
            if query in nimotsu:
                nimotsu[query] += 1
            else:
                nimotsu[query] = 1
    else:
        query *= -1
        if query in nimotsu:
            if nimotsu[query] == 1:
                del nimotsu[query]
            else:
                nimotsu[query] -= 1
    
print sum(nimotsu.values())