#include <fstream>
using namespace std;
ifstream fin ("transport.in");
ofstream fout ("transport.out");
long long v[16001],z,n,cmax;
bool Verificare (long long m)
{
    int i,km,ok;
    ok=0;
    km=m;
    i=1;
    if (m<cmax)
        return false;
    for (i=1;i<=n;++i)
    {
        if (km<v[i])
        {
            ok++;
            km=m;
        }
        if (km>=v[i])
        {
            km=km-v[i];
        }
    }
    ok++;
    if (ok<=z)
        return true;
    return false;
}
int main()
{
    long long i,st,dr,m;
    fin >>n>>z;
    cmax=-1;
    for (i=1;i<=n;++i)
    {
        fin >>v[i];
        if (v[i]>cmax)
            cmax=v[i];
    }
    st=1;
    dr=cmax*z;
    while (st<=dr)
    {
        m=(st+dr)/2;
        if (Verificare (m)==true)
        {
            if (Verificare (m-1)==false)
            {
                st=dr+1;
            }
            else
                dr=m-1;
        }
        else
            st=m+1;
    }
    fout <<m;
    fin.close ();
    fout.close ();
    return 0;
}