#include <fstream>
using namespace std;
ifstream cin ("transport.in");
ofstream cout ("transport.out");
int n, v[16000], k;

bool se_poate(int c)
{
    int nrt = 0, cc = 0;
    for (int i = 0; i < n; i++)
    {
        if (v[i] > c)
            return false;
        if (v[i] > cc)
        {
            cc = c;
            nrt++;
        }
        cc -= v[i];
    }
    return (nrt <= k);
}
int main()
{
    cin >> n >> k;
    int r = 0, pas = 1 << 28, i;
    for (i = 0; i < n; i++)
        cin >> v [i];
    while (pas > 0)
    {
        if (!se_poate(r + pas))
        {
            r += pas;
        }
        pas /= 2;
    }
    cout << r + 1;
    return 0;

}