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#include <fstream>
#include <deque>
using namespace std;
static const int MAXN = 5000009;
int v[MAXN];
int main()
{
int n, k;
ifstream f("deque.in");
f >> n >> k;
for(int i = 0; i < n; i++)
{
f >> v[i];
}
f.close();
long long sum = 0;
int lim = n - k + 1;
for(int i = 0; i < lim; i++)
{
int mink = 0x3F3F3F3F;
/*for(int j = 0; j < k; j++)
{
mink = min(mink, v[i + j]);
}*/
for(int j = i; j - i < k; j++)
{
mink = min(mink, v[j]);
}
sum += mink;
}
ofstream g("deque.out");
g << sum << '\n';
return 0;
}