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#include <iostream>
#include <fstream>
#define nMax 5000001
using namespace std;
ifstream fin("deque.in");
ofstream fout("deque.out");
int v[nMax];
int main()
{
int n, k, min, minIndex=-1, nk, ik;
long long s=0;
fin>>n>>k;
for(int i=1; i<=n; i++)
fin>>v[i];
nk=n-k;
for(int i=1; i<nk; i++)
{
if(i>minIndex)
{
min=10000000;
ik=i+k-1;
for(int j=i; j<=ik; j++)
{
if(v[j]<=min)
{
min=v[j];
minIndex=j;
}
}
s+=min;
}
else
{
if(v[i+k-1]<=min)
{
min=v[i+k-1];
minIndex=i+k-1;
}
s+=min;
}
}
fout<<s;
return 0;
}