#include <iostream>
#include <cstdio>
using namespace std;
int v[16010];
int saltele(int mijl,int v[16010],int n,int transporturi)
{
    int i,nr_trans,pp,s;
    i=1;
    nr_trans=0;
    pp=0;
    while (i<=n && pp==0)
    {
        s=0;
        while (s+v[i]<=mijl && i<=n)
        {
            s=s+v[i];
            i++;
        }
        nr_trans++;
        if (nr_trans>transporturi)
            pp=1;
    }
    if (pp==0)
        return 0;
    else
        return 1;
}
int main()
{
    freopen ("transport.in","r",stdin);
    freopen ("transport.out","w",stdout);
    int n,transporturi,s,maxx,st,dr,i,mijl,elem;
    cin>>n>>transporturi;
    s=maxx=0;
    for (i=1; i<=n; i++)
    {
        cin>>v[i];
        s=s+v[i];
        if (v[i]>maxx)
            maxx=v[i];
    }
    st=maxx;
    dr=s;
    while (st<=dr)
    {
        mijl=(st+dr)/2;
        if (saltele(mijl,v,n,transporturi)==1)
            st=mijl+1;
        else
        {
            dr=mijl-1;
            elem=mijl;
        }
    }
    cout<<mijl;
    return 0;
}