N, K = map(int, raw_input().split())

MX = 1000000
data = [0] * (MX + 1)

for _ in xrange(N):
    W = int(raw_input())

    if W > 0:
        if data[W:] < K:
            data[W] += 1
    elif W < 0:
        if data[-W] > 0:
            data[-W] -= 1

print sum(data)