import sys input = sys.stdin.buffer.readline class SegmentTree: """ https://qiita.com/dn6049949/items/afa12d5d079f518de368 から拝借しています。 """ def __init__(self, size, f=lambda x, y: min(x, y), default=10 ** 9 + 7): self.size = 2 ** (size - 1).bit_length() self.default = default self.dat = [default] * (self.size * 2) self.f = f def initialize(self, A): for i, a in enumerate(A, self.size): self.dat[i] = a for i in range(self.size - 1, 0, -1): self.dat[i] = self.f(self.dat[i * 2], self.dat[i * 2 + 1]) def update(self, i, x): i += self.size self.dat[i] = x while i > 0: i >>= 1 self.dat[i] = self.f(self.dat[i * 2], self.dat[i * 2 + 1]) def query(self, l, r): """半開区間[l,r)""" l += self.size r += self.size lres, rres = self.default, self.default while l < r: if l & 1: lres = self.f(lres, self.dat[l]) l += 1 if r & 1: r -= 1 rres = self.f(self.dat[r], rres) l >>= 1 r >>= 1 res = self.f(lres, rres) return res N, K = map(int, input().split()) A = tuple(map(int, input().split())) dp = SegmentTree(N + 1) dp.update(0, 0) for i, a in enumerate(A, 1): dp.update(i, dp.query(max(0, i - K), i) + a) print(sum(A) - dp.query(N + 1 - K, N + 1))