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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int main()
{
int n,k,nr=1,s,max=0,c,j;
fin>>n>>k;
int v[n];
for(int i=0;i<n;i++)
{
fin>>v[i];
}
for(int i=0;i<n;i+=c)
{
s=0;
c=nr;
j=i;
while(c>0)
{
s+=v[j];
j++;
c--;
}
k--;
c=nr;
nr++;
if(k==1 && nr<n-nr)
{
nr=n-nr;
}
if(max<s) max=s;
if(i+nr>n) break;
}
fout<<max;
return 0;
}