#include <fstream>

using namespace std;

const int N = 16000;
const int VMAX = 16000;

int v[N];

bool incap(int v[], int n, int t, int cap)
{
    int cap_c = 0, nr_t = 0;
    for (int i = 0; i < n; i++)
    {
        if (v[i] > cap)
        {
            return false;
        }
        if (v[i] > cap_c)
        {
            nr_t++;
            cap_c = cap;
        }
        cap_c -= v[i];
    }
    return (nr_t <= t);
}

int caut_bin(int v[], int n, int t)
{
    int st = 1, dr = N*VMAX, rez = dr + 1;
    while (st <= dr)
    {
        int m = (st + dr) / 2;
        if (incap(v, n, t, m))
        {
            rez = m;
            dr = m - 1;
        }
        else
        {
            st = m + 1;
        }
    }
    return rez;
}

int main()
{
    ifstream in("transport.in");
    ofstream out("transport.out");
    int n, t;
    in >> n >> t;
    for (int i = 0; i < n; i++)
    {
        in >> v[i];
    }
    out << caut_bin(v, n, t) << "\n";
    in.close();
    out.close();
    return 0;
}