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#include <fstream>
#define maxn 5000005
int N, K;
int A[maxn], Deque[maxn];
int Front, Back;
long long Sum;
using namespace std;
int main()
{
ifstream fin("deque.in");
ofstream fout("deque.out");
fin>>N>>K;
for (int i = 1; i <= N; i++){
fin>>A[i];
}
Front = 1, Back = 0;
for (int i = 1; i <= N; i++){
while (Front <= Back && A[i] <= A[ Deque[Back] ]){
Back--;
}
Deque[++Back] = i;
if (Deque[Front] == i-K) Front++;
if (i >= K) Sum += A[ Deque[Front]];
}
fout<<Sum;
return 0;
}