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

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

int a[16003], n, k;

int Test (int C)
{
    ///ret 1 daca pot imparti vect
    ///in cel mult k secv fiecare
    ///secv avand suma <= C
    int s = 0, i, cnt = 1;
    for (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 CB()
{
    int st, dr, mij, p;
    st = p = 1;
    dr = 256000000;
    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 << CB();
    return 0;
}