#include <fstream>

using namespace std;

int v[16001];
int n, k;

bool verificare(int mij)
{
    int s = 0, nrtransport = 1;
    for (int i = 1; i <= n; ++i)
    {
        s = s + v[i];
        if (s > mij)
        {
            nrtransport++;
            s = v[i];
        }
    }
    if (nrtransport <= k)
        return 1;
    return 0;
}

int main()
{
    ifstream cin ("transport.in");
    ofstream cout ("transport.out");
    cin >> n >> k;
    for (int i = 1; i <= n; ++i)
        cin >> v[i];

    int st = 0, dr = 256000000;
    while (st <= dr)
    {
        int mij = (st + dr) / 2;
        /// facem verificare
        if (verificare(mij) == 0)
            st = mij + 1;
        else
            dr = mij - 1;
    }

    cout << st << '\n';
    return 0;
}