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#include <iostream>
#include <deque>
#include <fstream>
using namespace std;
typedef long long int big;
ifstream f ("deque.in");
ofstream g ("deque.out");
deque < int > DQ;
int v[5000005], n, k;
big S;
int main()
{
f >> n >> k;
for(int i = 1; i <= n; ++i)
f >> v[i];
DQ.push_back(1);
for(int i = 2; i <= n; ++i)
{
while(!DQ.empty() && v[i] <= v[DQ.back()])
DQ.pop_back();
DQ.push_back(i);
if(DQ.front() == i - k)
DQ.pop_front();
if(i >= k)
S += v[DQ.front()];
}
g << S;
}