#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair<int,int> P;
#define REP(i,n) for(ll i=0;i<ll(n);i++)



ll a[200010];

#define T 200010
#define INF 1e18
ll n,N,tree[4*T];

void init(){
  n=1;
  while(n<N) n*=2;
  REP(i,2*n) tree[i]=INF;
}

void update(ll k, ll a){
  k=n-1+k;
  tree[k]=a;
  while(k>0){
    k=(k-1)/2;
    tree[k]=min(tree[2*k+1], tree[2*k+2]);
  }
}

ll query(ll a, ll b, ll k, ll l, ll r){
  if(r<=a || b<=l) return INF;
  if(a<=l && r<=b) return tree[k];
  else return min(query(a,b,2*k+1,l,(l+r)/2),query(a,b,2*k+2,(l+r)/2,r));
}


int main(void){
	ll i;

	cin.tie(0);  ios_base::sync_with_stdio(false);

	ll K;
	cin >> N >> K;
	ll S=0;
	for(i=1;i<=N;i++){
		cin >> a[i];
		S+=a[i];
	}

	N++;

	init();

	update(0,0);

	for(i=1;i<=N;i++){

		ll mn=query(max(i-K,0LL),i,0,0,n);
		update(i,a[i]+mn);

		if(i==N){
			cout << S-a[i]-mn << endl;
			return 0;
		}



	}





	return 0;
}