#include <bits/stdc++.h>
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");

int a[16005],n,k;

void Citire()
{
    int i;
    fin>>n>>k;
    for (i=1;i<=n;i++)
        fin>>a[i];
}

///returneaza 1 daca sirul se poate imparti in cel mult k grupe
///fiecare grupa avand suma <= s
int SePoateImparti(int s)
{
    int suma,ct,i;
    suma=0; ct=1;
    for (i=1;i<=n;i++)
        if (suma+a[i]<=s) suma+=a[i];
        else
        {
            ct++;
            suma=a[i];
        }
    if (ct<=k) return 1;
    return 0;
}

void CautBin()
{
    int st,dr,p,mj;
    st=1;
    dr=256000000;
    p=256000000;
    while(st<=dr)
    {
        mj=st+(dr-st)/2;
        if (SePoateImparti(mj)==1)
        {
            p=mj;
            dr=mj-1;
        }
        else st=mj+1;
    }
    fout<<p;
}

int main()
{
    Citire();
    CautBin();
    fin.close();
    fout.close();
    return 0;
}