#include <fstream>

using namespace std;

ifstream fin("transport.in");
ofstream fout("transport.out");

int v[16000];
int N, k;

bool ok (int med)
{
    int i, sc=0, nrtr=0;
    for (i=1;i<=N;i++)
    {
        if (v[i]>med)
            return 0;
        if (sc+v[i]<=med)
            sc=sc+v[i];
        else
        {
            nrtr++;
            sc=v[i];
        }
    }
    nrtr++;
    return (nrtr<=k);
}

int bsl (int st, int dr)
{
    int med, last;
    while (st<=dr)
    {
        med=(st+dr)/2;
        if (ok(med))
        {
            last=med;
            dr=med-1;
        }
        else
            st=med+1;
    }
    return last;
}

int main()
{
    int i;
    long long s=0;
    fin>>N>>k;
    for (i=1;i<=N;i++)
    {
        fin>>v[i];
        s+=v[i];
    }
    fout<<bsl(1, s);
    return 0;
}