#include <bits/stdc++.h>
using namespace std;

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

int n, k, a[16003], nr, x;
long long s;

int main()
{
    ios_base::sync_with_stdio(0);
    fin.tie(0);
    fout.tie(0);
    long long i, j, st, dr, mij;
    fin >> n >> k;
    for (i = 1; i <= n; i++)
    {
        fin >> a[i];
        nr = max(nr, a[i]);
        s += a[i];
    }
    st = nr; dr = s; nr = 0;
    while (st <= dr)
    {
        mij = (st + dr) / 2;
        s = 0; x = 0;
        for (j = 1; j <= n; j++)
            if (a[j] + s <= mij) s += a[j];
            else
            {
                x++;
                s = a[j];
            }
        if (s != 0) x++;
        if (x <= k)
        {
            nr = mij;
            dr = mij - 1;
        }
        else st = mij + 1;
    }
    fout << nr << "\n";
    fout.close();
    return 0;
}