#include <fstream>
using namespace std;

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

int n, k, saltele[16005], st, dr, mid, ans;

bool functie(int x)
{
    int S = 0, grupe = 0;
    for (int i = 0; i < n; i++)
    {
        if (S + saltele[i] <= x)
            S += saltele[i];
        else
        {
            S = saltele[i];
            grupe++;
        }
    }
    if (grupe + 1 <= k)
        return true;
    else
        return false;
}

int main()
{
    fin >> n >> k;
    for (int i = 0; i < n; i++)
    {
        fin >> saltele[i];
        dr += saltele[i];
        st = max(saltele[i], st);
    }
    int sum = dr;
    while (st <= dr)
    {
        mid = (st + dr) / 2;
        if (functie(mid))
        {
            ans = mid;
            dr = mid - 1;
        }
        else
        {
            st = mid + 1;
        }
    }
    fout << ans;
    return 0;
}