#include <iostream>
#include <fstream>
#define NMAX 16001
using namespace std;
ifstream in("transport.in");
ofstream out("transport.out");
int v[NMAX],N,K,c,i,nr,c1;

int verificare (int k)
{
int c1=0, nr=0;
   for (i=0;i<N;i++)
    {
       // cout << 1;
        c1+=v[i];
        if (c1>k)
            {
                nr++;
                c1=0;
                i--;
            }
            else if (c1==k)
            {
                nr++; c1=0;
            }
           // cout<<nr;
    }
    if (c1>0) nr++;

    if (nr<=K)
        return 1;
    else return 0;
}

int main()
{ int s=0;
    in>>N;
    in>>K;
    for (i=0;i<N;i++)
    {in>>v[i]; s+=v[i];
     if (v[i]>c)
        c=v[i];
    }
    int li=c, ls=s,m;

    while (li<=ls)
    {
        m=(li+ls)/2;
        if (verificare(m)) ls=m-1;
        else li=m+1;

    }
    out<<m;

  return 0;
}