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#include <fstream>
using namespace std;
ifstream f("deque.in");
ofstream g("deque.out");
int v[100],m,n,i,j,mn,mn2,s,mn1,mn3,a[50000][5000],x;
int mn4(int i ,int j , int k, int l)
{
if(a[i][j]<a[k][l])return a[i][j];
else return a[k][l];
}
int main()
{
f>>n>>m;
mn2=mn=9999999;
for(i=1;i<=n;i++)
{
f>>x;
a[1][i]=x;
}
for(i=2;i<=n;i++)
{
for(j=1;j<=n;j++)
a[i][j]=mn4(i-1,j,i-1,j-1);
}
for(j=m;j<=n;j++)
s=s+a[m][j];
g<<s<<endl;
return 0;
}