#include <fstream>

using namespace std;

const int NMAX=16000;

int n,c[NMAX], k;

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

bool se_poate(int v)
{
    int cc=0, nrt=0;
    for (int i=0; i<n; i++)
    {
        if (c[i]>v)
        {
            return false;
        }
        if (c[i]>cc)
        {
            nrt++;
            cc=v;
        }
        cc-=c[i];
    }
    return (nrt<=k);
}

int main()
{
    in >> n >> k;
    for (int i=0; i<n; i++)
    {
        in >> c[i];
    }
    int v=1;
    while(!se_poate(v))
    {
        v++;
    }
    out << v;
    in.close();
    out.close();
    return 0;
    return 0;
}