#include <bits/stdc++.h>
#define ValoareaMea 100000

using namespace std;

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

int n,k,a[16000],mx,suma;

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

int NrDrumuri(int cap)
{
    int i,sum,nrd;
    i = 1;
    sum = nrd = 0;
    while(i <= n)
    {
        if(sum + a[i] <= cap)
        {
            sum += a[i];
            i++;
        }
        else
        {
            nrd++;
            sum = 0;
        }
    }
    return nrd+1;
}

void Rezolvare()
{
    int i,st,dr,mij,nr,sol;
    st = mx;
    dr = suma;
    sol = ValoareaMea;
    while(st <= dr)
    {
        mij = st + (dr-st)/2;
        nr = NrDrumuri(mij);
        if(nr <= k && mij <= sol)
        {
            sol = mij;
            dr = mij-1;
        }
        else st = mij+1;
    }
    fout<<sol<<"\n";
}

int main()
{
    Citire();
    Rezolvare();

    fin.close();
    fout.close();
    return 0;
}