#include <fstream>
#define MAX 16002

using namespace std;

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

int n,k,v[MAX],cmax;

int main()
{
    fin >> n >> k;

    int lo=1,hi=MAX*MAX;

    for (int i=1;i<=n;i++)
    {
        fin >> v[i];
        if (v[i]>lo)
            lo=v[i];
    }

    int mi=lo+(hi-lo)/2;
    while (lo<=hi)
    {
        int s=0,nrop=1;
        for (int i=1;i<=n;i++)
        {
            s+=v[i];
            if (s>mi)
            {
                s=v[i];
                nrop++;
            }
            if (nrop>k)
            {
                lo=mi+1;
                mi=lo+(hi-lo)/2;
                break;
            }
        }
        if (nrop<=k)
        {
            cmax=mi;
            hi=mi-1;
            mi=lo+(hi-lo)/2;
        }
    }

    fout << cmax;

    return 0;
}