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#include <bits/stdc++.h>
#define N 5000005
using namespace std;
ifstream fin("deque.in");
ofstream fout("deque.out");
int n,k;
int a[N];
void rezolva()
{
int i,j;
fin>>n>>k;
long long s;
s=0;
int minim=10000000;
for(i=1;i<=n;i++)
fin>>a[i];
for(i=1;i<=n-2;i++)
{
minim=10000000;
for(j=i;j<=k+i-1;j++)
{
if(a[j]<minim) minim=a[j];
}
s+=minim;
}
fout<<s;
}
int main()
{
rezolva();
return 0;
}