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#include <iostream>
#include <fstream>
using namespace std;
int t[5000000],dq[5000003],i,k,j,n,p,u;
void adauga(int poz)
{
if(i>=k&&dq[p]==i-k)p++;
while(u>=p&&t[dq[u]]>t[poz])u--;
u++;
dq[u]=poz;
}
int main()
{
ifstream fin("deque.in");
ofstream fout("deque.out");
fin>>n>>k;
for(i=1;i<=n;i++)
fin>>t[i];
p=1;
u=0;
long long int sum=0;
for(i=1;i<=k;i++)
{
adauga(i);
}
sum+=dq[1];
for(i=k+1;i<=n;i++)
{
adauga(i);
sum+=dq[p];
}
fout<<sum;
}