#include <iostream>
#include <fstream>

using namespace std;

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

const int NMAX = 16000;

int v[NMAX] , n , k;

bool incap (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 r = 0 , pas = 1<<27;
    while (pas!=0)
    {
        if (!incap(r+pas))
        {
            r += pas;
        }
        pas /= 2;
    }
    out << r+1;
    return 0;
}