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#include <iostream>
#include <fstream>
#include <deque>
#include <queue>
#define MAX_INT 0x3f3f3f3f
//deque infoarena
using namespace std;
ifstream fin("deque.in");
ofstream fout("deque.out");
deque<int> dq1;
int minDq1(deque<int> dq1){
int Min2=MAX_INT;
while(!dq1.empty()){
Min2 = min(Min2, dq1.front());
dq1.pop_front();
}
return Min2;
}
void showDq(deque<int> dq1){
while(!dq1.empty()){
fout<<dq1.front()<<'\n';
dq1.pop_front();
}
}
int main()
{
long long sum = 0;
int Min=MAX_INT, n, k, a;
fin>>n>>k;
for(int i=0; i<k; i++){
fin>>a;
dq1.push_front(a);
Min = min(Min, a);
//fout<<Min<<'\n';
}
sum+=Min;
for(int i=k; i<n; i++){
fin>>a;
dq1.push_front(a);
dq1.pop_back();
Min = minDq1(dq1);
sum+=Min;
//showDq(dq1);
//fout<<'\n';
//fout<<Min<<'\n';
}
fout<<sum;
return 0;
}