#include <fstream>

using namespace std;

const int NMAX=16000;

int n,v[NMAX],k;

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

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

int main()

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