#include <iostream>
#include <fstream>

using namespace std;

const int VMAX=16000 * 16000;

int v[VMAX], n, k;

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

bool suficient ( int c)
{
    int nrt = 0, cc = 0;
    for (int i=0; i < n; i++)
    {
        if(v[i]>c)
        {
            return false;
        }
        if(v[i]>cc)
        {
            nrt++;
            cc = c;
        }
        cc-=v[i];
    }
    return (nrt <= k);
}

int main()
{
    in>>n>>k;
    for(int i=0; i<n; i++)
    {
        in>>v[i];
    }
    int st=1;
    int dr = VMAX;
    while (st < dr)
    {
        int m = (st + dr) / 2;
        if (suficient (m))
        {
            dr = m;
        }
        else
        {
            st = m + 1;
        }
    }
    out<<st;
    return 0;
}