#include <fstream>

using namespace std;

const int N = 16000;
const int CMAX = 256e6;

int v[N], n, k;

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

int main()
{
    ifstream in("transport.in");
    ofstream out("transport.out");
    in >> n >> k;
    for (int i = 0; i < n; i++)
    {
        in >> v[i];
    }
    int st = 1, 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;
        }
    }
    out << rez << "\n";
    in.close();
    out.close();
    return 0;
}