#include <fstream>
#include <vector>
using namespace std;
ifstream cin("transport.in");
ofstream cout("transport.out");
short int v[16001];
int main()
{
    int n,k,st = -1 ,dr = 0,mijl,sol,i,s,nrt;
    cin >> n >> k;
    for (i = 1 ; i <= n ; i++)
    {
        cin >> v[i];
        if (v[i] > st)
        {
            st = v[i];
        }
        dr += v[i];
    }

    while (st <= dr)
    {
        mijl = (st + dr) / 2;
        s = 0;
        nrt = 1;
        for (i = 1 ; i <= n ; i++)
        {
            if (s + v[i] <= mijl)
            {
                s += v[i];
            }
            else
            {
                nrt++;
                s = v[i];
            }
        }

        if (nrt > k)
        {
            st = mijl + 1;
        }
        else
        {
            sol = mijl;
            dr = mijl - 1;
        }
    }
    cout << sol;
    return 0;
}