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#include <iostream>
#include <fstream>
#define nMax 5000000
using namespace std;
ifstream fin("deque.in");
ofstream fout("deque.out");
int v[nMax];
int main()
{
int n, k, min, minIndex;
long long s=0;
fin>>n>>k;
for(int i=1;i<=n;i++)
fin>>v[i];
for(int i=1;i<=n;i++){
min=10000000;
for(int j=i;j<=i+k-1;j++){
min=std::min(min, v[j]);
}
s+=min;
}
fout<<s;
return 0;
}