#include <iostream>
#include <fstream>

using namespace std;

ifstream f("transport.in");
ofstream g("transport.out");

int main()
{
    int v[16005], n, k, st, dr, mijl, cont, s = 0, nr;
    f >> n >> k;
    for (int i = 1; i <= n; i++)
    {
        f >> v[i];
    }
    st = 1;
    dr = 256000005;
    while (st != dr)
    {
        s = 0;
        cont = 1;
        mijl = (st + dr) / 2;
        for (int i = 1; i <= n; i++) {
            if (s + v[i] <= mijl)
            {
                s += v[i];
            }
            else {
                s = v[i];
                cont++;
            }
        }
        if (cont <= k) {
            dr = mijl;
        }
        else {
            st = mijl + 1;
        }
    }
    g << st;
    return 0;
}