#include <fstream>

using namespace std;

int v[16001];

ifstream cin("transport.in");
ofstream cout("transport.out");

int main()

{
    int n, k, i, st = 0, dr, sol, mij, t, s, s2 = 0;
    cin >> n >> k;
    for (i = 1; i <= n; i++)
    {
        cin >> v[i];
        if (st < v[i])
            st = v[i];
        s2 += v[i];
    }
    dr = s2;
    while (st <= dr)
    {
        mij = (st + dr) / 2;
        t = 1, s = 0;
        for (i = 1; i <= n; i++)
        {
            s = s + v[i];
            if (s > mij)
            {
                t++;
                s = v[i];
            }
        }
        if (t > k)
        {
            st = mij + 1;
        }
        else
        {
            dr = mij - 1;
            sol = mij;
        }
    }
    cout << sol;
    return 0;
}