#include <iostream>
#include <fstream>
using namespace std;
ifstream f ("transport.in") ;
ofstream g ("transport.out") ;
int v [ 16001 ], n, k, mx, s;
void citire()
{
    f>>n>>k;
    for (int i=1; i<=n; i++ )
    {
        f>>v[i];
        s+=v[i] ;
        if (v[i]>mx)
            mx=v[i];
    }
}
void cautabin()
{
    int nr=0, val=0, st=mx, dr=s, snr=0, mid;
    while (st<=dr)
    {
        nr=1 ;
        snr=0 ;
        mid=(st+dr)/2;
        for (int i=1; i<=n; i++)
            if (v[i]+snr<=mid)
                snr+=v[i];
            else
                nr++, snr=v[i] ;
        if(nr<=k)
            dr=mid-1, val=mid ;
        else
            st=mid+1 ;
    }
    g<<val ;
}
int main()
{
    citire();
    cautabin();
}