!/bin/python3

import math import os import random import re import sys

#

Complete the 'billboards' function below.

#

The function is expected to return an INTEGER.

The function accepts following parameters:

1. INTEGER k

2. INTEGER_ARRAY revenue

# def billboards(n,k, revenue): N,K=n,k total = sum(revenue)

if K == N:
    return (total)
else:
    x = revenue[: K + 1]

    min_value = min(x)
    min_index = x.index(min_value)

    for i in range(K + 1, N):
        if i - min_index >= K:
            min_value = min(x[i - (K + 1) : i + 1])
            min_index = x.index(min_value)

        x.append(min_value + revenue[i])

        if x[i] < min_value:
            min_value = x[i]
            min_index = i

    return (total - min(x[N - (K + 1) :]))

if name == 'main': fptr = open(os.environ['OUTPUT_PATH'], 'w')

first_multiple_input = input().rstrip().split()

n = int(first_multiple_input[0])

k = int(first_multiple_input[1])

revenue = []

for _ in range(n):
    revenue_item = int(input().strip())
    revenue.append(revenue_item)

result = billboards(n,k, revenue)

fptr.write(str(result) + '\n')

fptr.close()