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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("deque.in");
ofstream g("deque.out");
int n,k,v[5000000],st,dr,s,dq[5000000];
int main()
{
int i;
f>>n>>k;
for(i=0; i<n; i++)
f>>v[i];
st=0;
dr=-1;
for(i=0; i<n; i++)
{
if(st<=dr && dq[st]==i-k)
st++;
while(st<=dr && v[i]<=v[dq[dr]])
dr--;
dq[++dr]=i;
if(i>=k-1)
s=s+v[dq[st]];
}
g<<s;
return 0;
}