#include <fstream>

using namespace std;

const int N = 16000;
const int VMAX = 16000;
const int CMIN = 1;
const int CMAX = N * VMAX;

int n, k;
int v[N];

bool se_pot_transporta(int c)
{
    int c_c = c, nr_t = 1;
    for (int i = 0; i < n; i++)
    {
        if (v[i] > c)
        {
            return false;
        }
        if (v[i] > c_c)
        {
            nr_t++;
            c_c = c;
        }
        c_c -= v[i];
    }
    return (nr_t <= k);
}

int caut_bin_capacitatea()
{
    int st = CMIN, dr = CMAX, rez = dr + 1;
    while (st <= dr)
    {
        int m = (st + dr) / 2;
        if (se_pot_transporta(m))
        {
            rez = m;
            dr = m - 1;
        }
        else
        {
            st = m + 1;
        }
    }
    return rez;
}

int main()
{
    ifstream in("transport.in");
    ofstream out("transport.out");
    in >> n >> k;
    for (int i = 0; i < n; i++)
    {
        in >> v[i];
    }
    out << caut_bin_capacitatea() << "\n";
    in.close();
    out.close();
    return 0;
}