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#include <bits/stdc++.h>
using namespace std;
ifstream fin("deque.in");
ofstream fout("deque.out");
#define NMAX 5000001
int main()
{
vector<int> v(NMAX);
int n,k,minpoz,sum=0;
fin>>n>>k;
for(int i=0;i<n;++i){
fin>>v[i];
}
minpoz=-1;
for(int i=k-1;i<n;++i){
if(minpoz==i-k){
minpoz=i;
for(int j=i-k+1;j<i;++j){
if(v[minpoz]>v[j]){
minpoz=j;
}
}
}
else if(v[minpoz]>v[i]){
minpoz=i;
}
sum+=v[minpoz];
}
fout<<sum;
return 0;
}