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#include<bits/stdc++.h>
using namespace std;
ifstream f("deque.in");
ofstream g("deque.out");
deque<int>d;
vector<int>v;
int n, k, s, minim;
int main()
{
f>>n>>k;
for(int i=1; i<=n; i++)
{
int x;
f>>x;
v.push_back(x);
}
int b=k;
for(int i=0; i<v.size(); i++)
{
while(!d.empty() && v[i]<v[d.back()]) d.pop_back();
if(!d.empty() && d.front()==i-k ) d.pop_front();
d.push_back(i);
if(i>=k-1) minim=minim+v[d.front()];
}
g<<minim;
return 0;
}