#include <iostream>
#include <fstream>

using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");

const int M=16001;
int v[M];

bool verif(int c,int n,int ture)
{
    int s=0,k=0;
    for(int i=0; i<n; i++)
    {
        s+=v[i];
        if(s>c)
        {
            s=v[i];
            k++;
        }
    }
    k++;
    if(k>ture)
    {
        return false;
    }
    else
    {
        return true;
    }
}

int main()
{
   int n,k,s=0,cap=0,i;
   fin>>n>>k;
   for(i=1;i<=n;i++)
   {
       fin>>v[i];
       s=s+v[i];
       if(cap<v[i])
       {
           cap=v[i];
       }
   }
   if(cap<s/k)
   {
       cap=s/k;
   }
   while(verif(cap,n,k)==false)
   {
        cap++;
   }
   fout<<cap;
}