#include <iostream>
#include <fstream>
#define NMAX 16001

using namespace std;

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

int n,st,dr,a[NMAX],k,mij,sol;

bool verf(int vol)
{
    int volume = 0,kk = k;

    for(int i=0;i<n;i++)
    {
        if(a[i] +volume <=vol)
        {
            volume += a[i];
        }
        else
        {
          //  cout << i << " ";
            kk--;
            volume = a[i];
        }

        if(kk<=0)
        {
            return false;
        }
    }

    return true;
}

int main()
{
    in >> n >> k;

    for(int i=0;i<n;i++)
    {
        in >> a[i];
        st = max(a[i],st);
        dr += a[i];
    }

    while(st<=dr)
    {
        mij = (st+dr)/2;
        //cout << st << " " << dr << endl;
        if(verf(mij))
        {
            sol = mij;
            dr = mij-1;
        }
        else
        {
            st = mij+1;
        }
    }
    out << sol;
   // cout <<verf(7);
    return 0;
}