n, k = map(int, input().split())
weights = [0] * 1000001
ans = 0

for i in range(n):
    w = int(input())
    tmp = 0
    if w < 0:
        if weights[abs(w)] > 0:
            weights[abs(w)] -= 1
    else:
        if i < k:
           weights[w] += 1
        else:
            tmp = sum(weights[i:])
            if tmp < k:
                weights[w] += 1
        
for i in range(len(weights)):
    ans += weights[i]
    
print(ans)