#include<fstream>

using namespace std;

const int NMAX = 1e3;

int v[16*NMAX+1], N, K;
ifstream fin("transport.in");
ofstream fout("transport.out");

bool verifica(int m)
{
    int nrd = 0, s = 0;
    for (int i = 1; i<= N; i++)
    {
        if(v[i] > m)
            return false;
        if(s+v[i] <= m)
            s += v[i];
        else
        {
            nrd++;
            if(nrd > K)
                return false;
            s = v[i];
        }
    }
    return true;
}

int cb()
{
    int st = 1, dr = 16000*16000, rasp;
    while(st <= dr)
    {
        int m = (st+dr)/2;
        if(verifica(m))
            rasp = m, dr = m-1;
        else
            st = m+1;
    }
    return rasp;
}

int main()
{
    fin >> N >> K;
    for(int i = 1; i <= N; i++)
        fin >> v[i];
    fout << cb() << "\n";
    fin.close();
    fout.close();
    return 0;
}