#include <fstream>

using namespace std;

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

int v[N];

bool se_poate(int v[], int n, int k, int c)
{
    int cc = 0, nrt = 0;
    for (int i = 0; i < n; i++)
    {
        if (v[i] > c)
        {
            return false;
        }
        if (v[i] > cc)
        {
            nrt++;
            cc = c;
        }
        cc -= v[i];
        if (nrt > k)
        {
            return false;
        }
    }
    return true;
}


int main()
{
    ifstream in("transport.in");
    ofstream out("transport.out");
    int n, k;
    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_poate(v, n, k, m))
        {
            rez = m;
            dr = m - 1;
        }
        else
        {
            st = m + 1;
        }
    }
    out << rez << "\n";
    in.close();
    out.close();
    return 0;
}