#include <fstream>

using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int n, v[16001], i, k, st=-1, dr=0, mij,s=0,aux,kk;
int main()
{
    fin>>n>>k;
    for(i=1;i<=n;i++)
    {
        fin>>v[i];
        if(v[i]>st)
            st=v[i];
        dr+=v[i];
    }
    while(st<=dr)
    {
        mij=(st+dr)/2;
        s=0;
        kk=0;
        for(i=1;i<=n;i++)
        {
            if(s+v[i]<=mij)
                s+=v[i];
            else
            {
                s=v[i];
                kk++;
            }
        }
        kk++;
        if(kk>k)
            st=mij+1;
        else
        {
            dr=mij-1;
            aux=mij;
        }

    }
    fout<<aux;
    return 0;
}