#include <iostream>
#include <fstream>

using namespace std;

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

int v[16005];

int main()
{
    int n,k,i,j,nr;
    long long volumcamion,dr,st,med,volumtotal,s;
    fin>>n>>k;
    volumtotal=0;
    nr=0;
    s=0;
    for(i=1;i<=n;i++)
    {
        fin>>v[i];
        volumtotal=volumtotal+v[i];
    }
    st=1;
    dr=volumtotal;
    med=(st+dr)/2;
    while(st<=dr)
    {
        med=(st+dr)/2;
        s=0;
        nr=0;
        for(i=1;i<=n;i++)
        {
            if(v[i]>med)
            {
                nr=k+1;
                break;
            }
            else if(s+v[i]>med)
            {
                nr++;
                s=v[i];
            }
            else
                s=s+v[i];
        }
        nr++;
        if(nr>k)
        {
            st=med+1;
        }
        else if(nr<=k)
        {
            dr=med-1;
            volumcamion=med;
        }
    }
    fout<<volumcamion;
    return 0;
}