#include <bits/stdc++.h>

using namespace std;

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

int a[16003], n, k;

//ret. 1 daca pot imparti vectorul in cel mult k secv.
//fiecare secv. avand suma <= C
bool Test(int C)
{
    int s = 0, cnt = 1;
    for (int i = 1; i <= n; i++)
    {
        if (a[i] > C) return 0;
        if (s + a[i] <= C) s += a[i];
        else cnt++, s = a[i];
    }
    return (cnt <= k);

}

int CautBin()
{
    int st, dr, mij, p;
    st = 1; dr = 256e6; p = 1;
    while (st <= dr)
    {
        mij = (st + dr) / 2;
        if (Test(mij) == 1)
        {
            p = mij;
            dr = mij - 1;
        }
        else st = mij + 1;
    }
    return p;
}

int main()
{
    int i;
    fin >> n >> k;
    for (i = 1; i <= n; i++)
        fin >> a[i];
    fout << CautBin();
    return 0;
}