#include <fstream>
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int n,k,i,a[16001],st,dr,mid,drumuri,vmax,vtotal,v,raspuns;
int main()
{
    fin>>n>>k;
    for(i=1; i<=n; i++)
    {
        fin>>a[i];
        if(a[i]>vmax)vmax=a[i];
        vtotal+=a[i];
    }
    st=vmax;
    dr=vtotal;
    while(st<=dr)
    {
        mid=(st+dr)/2;
        v=0;
        i=1;
        drumuri=1;
        while(i<=n)
        {
            if(v+a[i]<=mid)
                    v+=a[i];
            else
            {
                v=a[i];
                drumuri++;
            }
            i++;
        }
        if(drumuri>k)
            st=mid+1;
        else if(drumuri<=k)
            {dr=mid-1;raspuns=mid;}

    }
    fout<<raspuns;
    return 0;
}