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#include <iostream>
#include<fstream>
using namespace std;
long long v[50000010];
int deq[5000010];
int main()
{
ifstream in;
in.open("deque.in");
ofstream out;
out.open("deque.out");
int n,k ,start=1 , sfarsit=0;
long long suma = 0;
in>>n;
in>>k;
for(int i=0;i<n;i++)
{
in>>v[i];
while(start <= sfarsit && v[i]<=v[deq[sfarsit]])
sfarsit--;
sfarsit++;
deq[sfarsit] = i;
if(deq[start] < i-k+1)
start++;
if(i>=k-1)
suma = suma + v[deq[start]];
// cout<<suma<<endl;
}
out<<suma;
return 0;
}